@article{10_21136_CMJ_1977_101477,
     author = {Je\v{z}ek, Jaroslav},
     title = {Varieties of algebras with equationally definable zeros},
     journal = {Czechoslovak Mathematical Journal},
     pages = {394--414},
     year = {1977},
     volume = {27},
     number = {3},
     doi = {10.21136/CMJ.1977.101477},
     mrnumber = {0453610},
     zbl = {0383.08007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1977.101477/}
}