@article{1183420248,
author = {Underhill, A. L.},
title = {The second variation of a definite integral},
journal = {Bull. Amer. Math. Soc.},
volume = {16},
number = {3},
year = {1909},
pages = { 379-384},
language = {en},
url = {http://dml.mathdoc.fr/item/1183420248}
}
Underhill, A. L. The second variation of a definite integral. Bull. Amer. Math. Soc., Tome 16 (1909) no. 3, pp. 379-384. http://gdmltest.u-ga.fr/item/1183420248/