@article{BSL1_1_Surma2,
author = {Stanis{\l}aw J. SURMA},
title = {A Uniform Method of Proof of the Completeness Theorem for the Equivalential Propositional Calculus and for Some of its Extensions},
journal = {Bulletin of the Section of Logic},
volume = {1},
number = {1},
year = {1972},
pages = {53--62}
}