On extending backwards positive definite sequences. - Franciszek Hugon Szafraniec (Numer. Algorithms, 1992)

Detecting Mass Points of Representing Measures. - Franciszek Hugon Szafraniec (Numer. Algorithms, 2003)

Three term recurrence relation modulo ideal and orthogonality of polynomials of several variables. - Dariusz Cichon; Jan Stochel; Franciszek Hugon Szafraniec (J. Approx. Theory, 2005)