Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1989_307_1_a1, author = {I. M. Grudskii}, title = {The {Christoffel--Schwarz} formula for polyhedral surfaces}, journal = {Doklady Akademii Nauk}, pages = {15--17}, publisher = {mathdoc}, volume = {307}, number = {1}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_307_1_a1/} }
I. M. Grudskii. The Christoffel--Schwarz formula for polyhedral surfaces. Doklady Akademii Nauk, Tome 307 (1989) no. 1, pp. 15-17. http://geodesic.mathdoc.fr/item/DAN_1989_307_1_a1/