@book{PPN380673029,
title = {Methoden der mathematischen Physik Bd. 2},
series = {GDML\_Books},
year = {1937},
zbl = {0017.39702},
language = {ger},
url = {http://dml.mathdoc.fr/item/PPN380673029}
}
(éd.). Methoden der mathematischen Physik Bd. 2. GDML_Books (1937), http://gdmltest.u-ga.fr/item/PPN380673029/