@article{BSL9_4_Andreka_Burmeister_Nemeti,
author = {Hajnal ANDR{\'E}KA and Peter BURMEISTER and Istv{\'a}n N{\'E}METI},
title = {Quasi Equational Logic of Partial Algebras},
journal = {Bulletin of the Section of Logic},
volume = {9},
number = {4},
year = {1980},
pages = {193--197}
}