On orthogonal decomposition of two-dimensional vector fields A. Szustalewicz — 1984 Applicationes Mathematicae
On a variant of the matrix transformation method for approximate solution of partial differential equations of second degree A. Szustalewicz — 1971 Applicationes Mathematicae
Some remarks on the Galerkin approximation of parabolic equations H. Marcinkowska; A. Szustalewicz — 1988 Applicationes Mathematicae