@article{ZNSL_2004_316_a7,
     author = {V. P. Orevkov},
     title = {A~new decidable {Horn} fragment of the predicate calculus},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {147--162},
     publisher = {mathdoc},
     volume = {316},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2004_316_a7/}
}