Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1972__4_133906, author = {L.N. Shevrin}, title = {The {Sverdlovsk} tetrad.}, journal = {Semigroup forum}, pages = {274--280}, publisher = {mathdoc}, volume = {4}, year = {1972}, url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133906/} }
L.N. Shevrin. The Sverdlovsk tetrad.. Semigroup forum, Tome 4 (1972), pp. 274-280. http://geodesic.mathdoc.fr/item/SF_1972__4_133906/