@article{BSL19_3_Fijalkowska_Fijalkowski,
author = {Dorota FIJA{\L}KOWSKA and Jan FIJA{\L}KOWSKI},
title = {On Theories of Non-Monotonic Consequence Operations II},
journal = {Bulletin of the Section of Logic},
volume = {19},
number = {3},
year = {1990},
pages = {79--83}
}