@article{SM_1974_24_3_a5,
     author = {V. B. Lender},
     title = {On steps of solubility of lattices and degrees of idempotency of prevarieties of lattices},
     journal = {Sbornik. Mathematics},
     pages = {435--449},
     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1974_24_3_a5/}
}