@article{BSL9_4_Dywan_Stepien,
author = {Zdzis{\l}aw DYWAN and Teodor ST{\k{E}}PIE{\'N}},
title = {Every Two-Valued Propositional Calculus Has the Interpolation Property},
journal = {Bulletin of the Section of Logic},
volume = {9},
number = {4},
year = {1980},
pages = {152--153}
}