M. Gorawski T. Morzy R. Wrembel | Guest Editors' Introduction | 5-8 |

S. Greco R. Słowiński I. Szczęch | Analysis of monotonicity properties of some rule interestingness measures | 9-25 |

J. Stefanowski R. Ziembiński | An experimental evaluation of two approaches to mining context based sequential patterns | 27-45 |

P. Grudziński M. Wojciechowski | Integration of candidate hash trees in concurrent processing of frequent itemset queries using Apriori | 47-65 |

P. Kazienko K. Musiał A. Zgrzywa | Evaluation of node position based email communication | 67-86 |

A. Wierzbicki M. Morzy A. Papadopoulos | Mining online auction social networks for reputation and recommendation | 87-106 |

T. Morzy W. Andrzejewski Z. Królikowski | How to improve efficiency of analysis of sequential data? | 107-126 |

R. Wrembel W. Andrzejewski Z. Królikowski M. Masewicz | Predicting access to materialized methods by means of hidden Markov model | 127-152 |

M. Gorawski | Time complexity of page filling algorithms in Materialized Aggregate List (MAL) and MAL/TRIGG materialization cost | 153-172 |

T. Pankowski | Schema mapping and query reformulation in peer-to-peer XML data integration system | 173-192 |

M. Falkowski C. Jędrzejek | An efficient SQL-based querying method to RDF schemata | 193-213 |

K. Jankiewicz | SXCCP+: Simple XML Concurrency Control Protocol for XML Database Systems | 215-237 |

I. Ntoutsi M. Spiliopolou Y. Theodoridis | Tracing cluster transitions for different cluster types | 239-259 |

L. Rokach L. Naamani A. Shmilovici | Active learning using pessimistic expectation estimators | 261-280 |

P. Białoń | A linear Support Vector Machine solver for a large number of training examples | 281-300 |

G. De Tré S. Zadrożny | Guest Editorial: Fuzzy logic and soft computing in an effective and efficient processing of imperfect information - in memoriam Ashley Morris | 305-307 |

G. De Tré S. Zadrożny | In Memoriam Ashley Morris (1963-2008) | 309-310 |

A. González N. Marín O. Pons M. Amparo Vila | Fuzzy certainty on fuzzy values | 311-339 |

G. De Tré A. Hallez A. Bronselaer | A possibilistic view on set and multiset comparison | 341-366 |

Q. Wei G. Chen X. Zhou | Properties and pre-processing strategies to enhance the discovery of functional dependency with degree of satisfaction | 367-394 |

L. Lietard D. Rocacher | Conditions with aggregates evaluated using gradual numbers | 395-417 |

R. Angryk | Attribute-oriented defuzzification of fuzzy database tuples with categorical entries | 419-453 |

D. Ortiz-Arroyo H. Christensen | An optimized soft computing-based passage retrieval system | 455-479 |

M. Wallace | Ontologies and soft computing in flexible querying | 481-507 |

J. Verstraete | Fuzzy regions: interpretations of surface area and distance | 509-526 |

T. Kaczorek P. Przyborowski | Reachability, controllability to zero and observability of the positive discrete-time Lyapunov systems | 529-541 |

W. Krajewski U. Viaro | Iterative-interpolation algorithms for $L_{2}$ model reduction | 543-554 |

K. Khazafi N. Rueda P. Enflo | Multiobjective variational programming under generalized (V,ρ)-B-type I functions | 555-572 |

M. Hinze U. Matthes | A note on variational discretization of elliptic Neumann boundary control | 577-591 |

M. Sun Y. Jia | Persistent bounded disturbance rejection for uncertain time-delay systems | 593-607 |

K. Latawiec W. Hunek | Minimum variance control of discrete-time and continuous-time LTI MIMO systems - a new unified framework | 609-624 |

Y. Hacı K. Özen | Terminal control problem for processes represented by nonlinear multi parameter binary dynamic system | 625-633 |

M. Zareinejad S. Mehdi Rezaei S. Shiry Ghidary A. Abdullah M. Motamedi | Robust impedance control of a piezoelectric stage under thermal and external load disturbances | 635-648 |

A. Dahimene A. Azrar M. Noureddine | Incomplete matrix partial fraction expansion | 649-654 |

J. Tabor J. Tabor | Generalized approximate midconvexity | 655-669 |

M. Libura | On the robustness of optimal solutions for combinatorial optimization problems | 671-685 |

Y. Wang P. Fei | A primal-infeasible interior point algorithm for linearly constrained convex programming | 687-704 |

J. Pomykała T. Trabszys | Anonymous signer verifiable encrypted signature from bilinear pairing | 705-712 |

M. Kubale K. Ocetkiewicz | A new optimal algorithm for a time-dependent scheduling problem | 713-721 |

E. Figielska | Heuristic algorithms for preemptive scheduling in a two-stage flowshop with unrelated parallel machines and 0-1 resource requirements | 723-743 |

A. Tereso R. Novais M. Araujo S. Elmaghraby | Optimal resource allocation in stochastic activity networks via the electromagnetism approach: a platform implementation in Java | 745-782 |

G. Grabowska M. Wiech | Analysis of data from the European Economic Survey 2005 on Economic Climate in Polish Servicing Sector | 783-810 |

N. Nikolova | Empirical justification of the uncertain equivalence method | 811-834 |

N. Nikolova K. Tenekedjiev F. Dong K. Hirota | Comparison of linear interpolation and arctan approximation of one-dimensional monotonic utility functions based on experimental data | 835-861 |

W. Hung W. Hong | Application of SVR with improved ant colony optimization algorithms in exchange rate forecasting | 863-891 |

J. Gadomski | Dynamics of loans in the Polish banking system | 893-911 |

K. Malanowski A. Ioffe F. Tröltzsch | Preface | 915-916 |

A. Dmitruk | On the development of Pontryagin's Maximum Principle in the works of A. Ya. Dubovitskii and A. A. Milyutin | 923-957 |

R. Gamkrelidze | Hamiltonian form of the maximum principle | 959-971 |

H. Pesch M. Plail | The maximum Principle of optimal control: A history of ingenious ideas and missed opportunities | 973-995 |

V. Tikhomirov V. Demidovich | A few words about history of extremal problems at Moscow University | 997-999 |

Z. Artstein | Pontryagin Maximum Principle for coupled slow and fast systems | 1003-1019 |

J. Bonnans A. Hermant | Revisiting the analysis of optimal control problems with several state constraints | 1021-1052 |

B. Bonnard D. Sugny | Geometric optimal control and two-level dissipative quantum systems | 1053-1080 |

A. Bressan | From optimal control to non-cooperative differential games: a homotopy approach | 1081-1106 |

G. Buttazzo E. Mainini E. Stepanov | Stationary configurations for the average distance functional and related problems | 1107-1130 |

E. Casas | Exact penalization of pointwise constraints for optimal control problems | 1131-1150 |

F. Clarke M. do Rosario de Pinho | The nonsmooth maximum principle | 1151-1167 |

R. Vinter F. Clarke | Stability analysis of sliding-mode feedback control | 1169-1192 |

Š. Nečasová L. Consiglieri J. Sokolowski | Incompressible Maxwell-Boussinesq approximation: Existence, uniqueness and shape sensitivity | 1193-1215 |

J. de Los Reyes K. Kunisch | Optimal control of partial differential equations with affine control constraints | 1217-1249 |

T. Donchev E. Farkhi | On the theorem of Filippov-Pliś and some applications | 1251-1271 |

K. Malanowski A. Ioffe F. Tröltzsch | Preface | 1275-1276 |

V. Veliov A. Dontchev | Metric regularity under approximations | 1283-1303 |

U. Felgenhauer L. Poggiolini G. Stefani | Optimality and stability result for bang-bang optimal controls with simple and double switch behaviour | 1305-1325 |

H. Frankowska | Normality of the maximum principle for absolutely continuous solutions to Bolza problems under state constraints | 1327-1340 |

J. Raymond | Degeneracy and generalized solutions of optimal control problems | 1341-1358 |

A. Halanay D. Tiba | Shape optimization for stationary Navier-Stokes equations | 1359-1374 |

B. Jakubczyk | Curvatures of single-input control systems | 1375-1391 |

S. Kesavan J. Raymond | On a degenerate Riccati equation | 1393-1410 |

M. Krastanov | High-order variations and small-time local attainability | 1411-1427 |

I. Lasiecka A. Tuffaha | A Bolza optimal synthesis problem for singular estimate control systems | 1429-1460 |

R. Triggiani C. Lebiedzik | Optimal regularity and optimal control of a thermoelastic structural acoustic model with point control and clamped boundary conditions | 1461-1499 |

U. Ledzewicz H. Schaettler | Singular controls and chattering arcs in optimal control problems arising in biomedicine | 1501-1523 |

C. Nour R. Stern J. Takche | The union of uniform closed balls conjecture | 1525-1534 |

N. Osmolovskii | Second order conditions in optimal control problems with mixed equality-type constraints on a variable time interval | 1535-1556 |

J. Outrata M. Červinka | On the implicit programming approach in a class of mathematical programs with equilibrium constraints | 1557-1574 |

R. Rockafellar | Hamiltonian trajectories and saddle points in mathematical economics | 1575-1588 |

V. Tikhomirov | Lagrange principle and necessary conditions | 1589-1605 |

A. Zaslavski | Convergence of approximate solutions of variational problems | 1607-1629 |

J. Zolésio | Variational formulation for incompressible Euler flow/shape-morphing metric and geodesic | 1631-1653 |

. | List of referees of volume 38 (2009) | 1669-1672 |