Geodesic
AЁvariety of semigroups without an irreducible basis for identities
Matematičeskie zametki, Tome 21 (1977) no. 6, pp. 865-872.

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An example of a variety of semigroups not having an irreducible basis for identities is given. Also a variety of semigroups, the lattice of subvarieties of which contains a nonidentity element without any coverings, is constructed. 
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     author = {A. N. Trakhtman},
     title = {A{\CYRYO}variety of semigroups without an irreducible basis for identities},
     journal = {Matemati\v{c}eskie zametki},
     pages = {865--872},
     publisher = {mathdoc},
     volume = {21},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_6_a14/}
}
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A. N. Trakhtman. AЁvariety of semigroups without an irreducible basis for identities. Matematičeskie zametki, Tome 21 (1977) no. 6, pp. 865-872. http://geodesic.mathdoc.fr/item/MZM_1977_21_6_a14/