Steinhaus chessboard theorem Władysław Kulpa; Lesƚaw Socha; Marian Turzański — 2000 Acta Universitatis Carolinae. Mathematica et Physica
Parametric extension of the Poincaré theorem Władysław Kulpa; Lesƚaw Socha; Marian Turzański — 2000 Acta Universitatis Carolinae. Mathematica et Physica