Unary operations on pseudovarieties of semigroups
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1995), pp. 45-52.

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     author = {I. Yu. Zhil'tsov},
     title = {Unary operations on pseudovarieties of semigroups},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {45--52},
     publisher = {mathdoc},
     number = {1},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1995_1_a3/}
}
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I. Yu. Zhil'tsov. Unary operations on pseudovarieties of semigroups. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1995), pp. 45-52. http://geodesic.mathdoc.fr/item/IVM_1995_1_a3/