@article{AL_2009_48_1_a3,
     author = {M. A. Pervukhin and A. A. Stepanova},
     title = {Axiomatizability and completeness of some classes of partially ordered polygons},
     journal = {Algebra i logika},
     pages = {90--121},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2009_48_1_a3/}
}