@article{ZNSL_1976_60_a10,
     author = {V. P. Orevkov},
     title = {Solvable classes of pseudoprenex formulas},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {109--170},
     year = {1976},
     volume = {60},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_60_a10/}
}