@article{AL_2012_51_6_a3,
     author = {A. Kungozhin},
     title = {Existentially closed and maximal models in positive logic},
     journal = {Algebra i logika},
     pages = {748--765},
     publisher = {mathdoc},
     volume = {51},
     number = {6},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2012_51_6_a3/}
}