@article{AL_1991_30_1_a6,
     author = {N. D. Podufalov},
     title = {Regular sets and collineations of projective planes},
     journal = {Algebra i logika},
     pages = {90--101},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1991_30_1_a6/}
}