@article{1077491090,
author = {McShane, E. J.},
title = {The Jacobi condition and the index theorem in the calculus of variations},
journal = {Duke Math. J.},
volume = {5},
number = {1},
year = {1939},
pages = { 184-206},
language = {en},
url = {http://dml.mathdoc.fr/item/1077491090}
}
McShane, E. J. The Jacobi condition and the index theorem in the calculus of variations. Duke Math. J., Tome 5 (1939) no. 1, pp. 184-206. http://gdmltest.u-ga.fr/item/1077491090/