@article{CMUC_2007__48_4_a3,
     author = {Vernikov, Boris M.},
     title = {On modular elements of the lattice of semigroup varieties},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {595--606},
     publisher = {mathdoc},
     volume = {48},
     number = {4},
     year = {2007},
     mrnumber = {2375161},
     zbl = {1174.20324},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2007__48_4_a3/}
}