@article{BSL4_4_Blaszczuk_Dziobiak,
author = {Jerzy J. B{\L}ASZCZUK and Wies{\l}aw DZIOBIAK},
title = {Modal Systems Placed in the ``Triangle'' $S4$ -- $T_1^*$ -- $T$},
journal = {Bulletin of the Section of Logic},
volume = {4},
number = {4},
year = {1975},
pages = {136--137}
}