Geodesic
Semivarieties and Schreier varieties of unary algebras
Matematičeskie zametki, Tome 15 (1974) no. 2, pp. 263-270.

Voir la notice de l'article provenant de la source Math-Net.Ru

A correction is provided for one result of a paper by Shafaat [1], and it is proven that the set of Schreier varieties of algebras $\left$ with two unary operations has the cardinality of the continuum. 
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     author = {A. I. Budkin},
     title = {Semivarieties and {Schreier} varieties of unary algebras},
     journal = {Matemati\v{c}eskie zametki},
     pages = {263--270},
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     year = {1974},
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     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_2_a11/}
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A. I. Budkin. Semivarieties and Schreier varieties of unary algebras. Matematičeskie zametki, Tome 15 (1974) no. 2, pp. 263-270. http://geodesic.mathdoc.fr/item/MZM_1974_15_2_a11/