@article{BSL8_3_Suszko_Weinfeld,
author = {Hajnal ANDR{\'E}KA and Istv{\'a}n N{\'E}METI, and Ildik{\'o} SAIN},
title = {Filters and Natural Extensions of Closure},
journal = {Bulletin of the Section of Logic},
volume = {8},
number = {3},
year = {1979},
pages = {130--132}
}