@article{SM_1968_6_1_a6,
     author = {K.-H. Fichtner},
     title = {On the theory of varieties of universal algebras with ideals},
     journal = {Sbornik. Mathematics},
     pages = {115--124},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1968_6_1_a6/}
}