@article{AL_2003_42_1_a4,
     author = {L. L. Maksimova},
     title = {Implicit {Definability} and {Positive} {Logics}},
     journal = {Algebra i logika},
     pages = {65--93},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2003_42_1_a4/}
}