@article{1183493594,
author = {Hadamard, Jacques},
title = {On ordinary restricted extrema in connection with point transformations},
journal = {Bull. Amer. Math. Soc.},
volume = {35},
number = {6},
year = {1929},
pages = { 823-828},
language = {en},
url = {http://dml.mathdoc.fr/item/1183493594}
}
Hadamard, Jacques. On ordinary restricted extrema in connection with point transformations. Bull. Amer. Math. Soc., Tome 35 (1929) no. 6, pp. 823-828. http://gdmltest.u-ga.fr/item/1183493594/