@article{AL_1995_34_3_a8,
     author = {K. N. Ponomarev},
     title = {Semialgebraic sets and variants of the},
     journal = {Algebra i logika},
     pages = {329--346},
     publisher = {mathdoc},
     volume = {34},
     number = {3},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1995_34_3_a8/}
}