@article{ZNSL_1971_20_a11,
     author = {G. E. Mints},
     title = {Quantifier-free and one-quantifier systems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {115--133},
     year = {1971},
     volume = {20},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_20_a11/}
}