@article{GDZPPN002375125,
title = {A Note on the Extremal Surfaces in the Calculus of Variations},
journal = {Mathematische Zeitschrift},
volume = {38},
year = {1934},
pages = {465-467},
zbl = {0008.36103},
url = {http://dml.mathdoc.fr/item/GDZPPN002375125}
}
Haviland, E. K. A Note on the Extremal Surfaces in the Calculus of Variations. Mathematische Zeitschrift, Tome 38 (1934) pp. 465-467. http://gdmltest.u-ga.fr/item/GDZPPN002375125/