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@article{10_4064_cm_53_1_1_7, author = {J. P{\l}onka}, title = {On lattices of varieties of universal algebras}, journal = {Colloquium Mathematicum}, pages = {1--7}, publisher = {mathdoc}, volume = {53}, number = {1}, year = {1987}, doi = {10.4064/cm-53-1-1-7}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-53-1-1-7/} }
J. Płonka. On lattices of varieties of universal algebras. Colloquium Mathematicum, Tome 53 (1987) no. 1, pp. 1-7. doi : 10.4064/cm-53-1-1-7. http://geodesic.mathdoc.fr/articles/10.4064/cm-53-1-1-7/
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