@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/