@article{SM_1974_22_4_a5,
     author = {M. S. Burgin},
     title = {Schreier varieties of linear $\Omega$-algebras},
     journal = {Sbornik. Mathematics},
     pages = {561--579},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1974_22_4_a5/}
}