@article{FPM_1999_5_1_a15,
     author = {A. V. Tishchenko},
     title = {The partially ordered monoid of semigroup varieties under wreath product},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {283--305},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1999_5_1_a15/}
}