@article{1195579213,
author = {Hombu, Hitoshi},
title = {Die Geometrie des Integrals $\int {F\left( {x,x^{\left( 1 \right)} , \ldots ,x^{\left( m \right)} } \right)dt}$},
journal = {Proc. Imp. Acad.},
volume = {16},
number = {10},
year = {1940},
pages = { 97-103},
language = {de},
url = {http://dml.mathdoc.fr/item/1195579213}
}
Hombu, Hitoshi. Die Geometrie des Integrals $\int {F\left( {x,x^{\left( 1 \right)} , \ldots ,x^{\left( m \right)} } \right)dt}$. Proc. Imp. Acad., Tome 16 (1940) no. 10, pp. 97-103. http://gdmltest.u-ga.fr/item/1195579213/