@article{1183421077,
author = {Richardson, R. G. D.},
title = {On the saddlepoint in the theory of maxima and minima and in the calculus of variations},
journal = {Bull. Amer. Math. Soc.},
volume = {18},
number = {3},
year = {1911},
pages = { 177-184},
language = {en},
url = {http://dml.mathdoc.fr/item/1183421077}
}
Richardson, R. G. D. On the saddlepoint in the theory of maxima and minima and in the calculus of variations. Bull. Amer. Math. Soc., Tome 18 (1911) no. 3, pp. 177-184. http://gdmltest.u-ga.fr/item/1183421077/