@article{MT_1989_12_a1,
     author = {S. S. Goncharov},
     title = {Characterization of axiomatizable classes with strong epimorphisms},
     journal = {Matemati\v{c}eskie trudy},
     pages = {24--39},
     publisher = {mathdoc},
     volume = {12},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1989_12_a1/}
}