@article{JSFU_2017_10_3_a4,
     author = {Artem N. Shevlyakov},
     title = {Equationally extremal semilattices},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {298--304},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2017_10_3_a4/}
}