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@article{SF_1990__41_2_135057, author = {T. Papazyan}, title = {Filters and semigroup properties.}, journal = {Semigroup forum}, pages = {329--338}, publisher = {mathdoc}, volume = {41}, number = {2}, year = {1990}, zbl = {0702.22005}, url = {http://geodesic.mathdoc.fr/item/SF_1990__41_2_135057/} }
T. Papazyan. Filters and semigroup properties.. Semigroup forum, Tome 41 (1990) no. 2, pp. 329-338. http://geodesic.mathdoc.fr/item/SF_1990__41_2_135057/