@book{401379,
title = {Lineare Differentialtransformationen 2. Ordnung},
series = {GDML\_Books},
publisher = {VEB Deutscher Verlag der Wissenschaften},
address = {Berlin},
year = {1967},
language = {de},
url = {http://dml.mathdoc.fr/item/401379}
}
Borůvka, Otakar. Lineare Differentialtransformationen 2. Ordnung. GDML_Books (1967), http://gdmltest.u-ga.fr/item/401379/