@article{FPM_2008_14_7_a4,
     author = {B. M. Vernikov},
     title = {Upper-modular elements of the lattice of semigroup {varieties.~II}},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {43--51},
     publisher = {mathdoc},
     volume = {14},
     number = {7},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2008_14_7_a4/}
}