@book{PPN380672502,
title = {Methoden der mathematischen Physik Bd. 1},
series = {GDML\_Books},
year = {1924},
zbl = {50.0335.07},
language = {ger},
url = {http://dml.mathdoc.fr/item/PPN380672502}
}
(éd.). Methoden der mathematischen Physik Bd. 1. GDML_Books (1924), http://gdmltest.u-ga.fr/item/PPN380672502/