@article{BSL8_2_Dziobiak_Sachwanowicz,
author = {Wies{\l}aw DZIOBIAK and Wojciech SACHWANOWICZ},
title = {On Two Notions Concerning the Structural Sentential Calculi},
journal = {Bulletin of the Section of Logic},
volume = {8},
number = {2},
year = {1979},
pages = {54--60}
}