@article{BSL2_2_Stepien,
author = {Teodor ST{\k{E}}PIE{\'N}},
title = {A Survey on Minor Wajsberg's Results Concerning Fragmentary Systems of the Classical Propositional Calculus (on the basis of Wajsberg's papers [3], [10], [11])},
journal = {Bulletin of the Section of Logic},
volume = {2},
number = {2},
year = {1973},
pages = {103--106}
}