Voir la notice de l'article provenant de la source Math-Net.Ru
@article{AL_1972_11_6_a2, author = {S. D. Denisov}, title = {Models of a noncontradictory formula and the hierarchy of {Er\v{s}ov}}, journal = {Algebra i logika}, pages = {648--655}, publisher = {mathdoc}, volume = {11}, number = {6}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1972_11_6_a2/} }
S. D. Denisov. Models of a noncontradictory formula and the hierarchy of Er\v{s}ov. Algebra i logika, Tome 11 (1972) no. 6, pp. 648-655. http://geodesic.mathdoc.fr/item/AL_1972_11_6_a2/