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@article{AL_1968_7_5_a3, author = {Ahmad Shafaat}, title = {Clusters of algebra}, journal = {Algebra i logika}, pages = {109--116}, publisher = {mathdoc}, volume = {7}, number = {5}, year = {1968}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AL_1968_7_5_a3/} }
Ahmad Shafaat. Clusters of algebra. Algebra i logika, Tome 7 (1968) no. 5, pp. 109-116. http://geodesic.mathdoc.fr/item/AL_1968_7_5_a3/