Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1991_317_2_a1, author = {N. A. Bobylev and Yu. M. Burman}, title = {Morse lemmas for integral functionals}, journal = {Doklady Akademii Nauk}, pages = {267--270}, publisher = {mathdoc}, volume = {317}, number = {2}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_2_a1/} }
N. A. Bobylev; Yu. M. Burman. Morse lemmas for integral functionals. Doklady Akademii Nauk, Tome 317 (1991) no. 2, pp. 267-270. http://geodesic.mathdoc.fr/item/DAN_1991_317_2_a1/