@article{PPN37649882X+dmdlog13, title = {Theorie des Amslerschen Polarplanimeters.}, booktitle = {Geometrie Bd. 2}, series = {GDML\_Books}, year = {1968}, pages = {11}, url = {http://dml.mathdoc.fr/item/PPN37649882X+dmdlog13} }
(éd.). Theorie des Amslerschen Polarplanimeters., dans Geometrie Bd. 2, GDML_Books, (1968), p. 11. http://gdmltest.u-ga.fr/item/PPN37649882X+dmdlog13/