@article{PPN236010751+dmdlog14, title = {De integratione formulae differentialis (1 + n cos(phi))d phi}, booktitle = {Arithmetik und Algebra : Nachtr\"age zu Band 1 - 3 Bd. 8}, series = {GDML\_Books}, year = {1900}, pages = {35}, url = {http://dml.mathdoc.fr/item/PPN236010751+dmdlog14} }
(éd.). De integratione formulae differentialis (1 + n cos(phi))d phi, dans Arithmetik und Algebra : Nachträge zu Band 1 - 3 Bd. 8, GDML_Books, (1900), p. 35. http://gdmltest.u-ga.fr/item/PPN236010751+dmdlog14/