Acoustic wave equation in the expanding universe. Sachs-Wolfe theorem - Wojciech Czaja; Zdzislaw A. Golda; Andrzej Woszczyna (CoRR, 2009)

Symbolic Tensor Calculus - Functional and Dynamic Approach. - Andrzej Woszczyna; P. Plaszczyk; Wojciech Czaja; Zdzislaw A. Golda (CoRR, 2016)