Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1985__21_4_a1, author = {Guggenheimer, H.}, title = {A {Leighton-Bor\r{u}vka} formula for {Morse} conjugate points}, journal = {Archivum mathematicum}, pages = {189--193}, publisher = {mathdoc}, volume = {21}, number = {4}, year = {1985}, mrnumber = {833130}, zbl = {0585.34024}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1985__21_4_a1/} }
Guggenheimer, H. A Leighton-Borůvka formula for Morse conjugate points. Archivum mathematicum, Tome 21 (1985) no. 4, pp. 189-193. http://geodesic.mathdoc.fr/item/ARM_1985__21_4_a1/