@article{PPN37649882X+dmdlog64, title = {Die Tissotschen S\"atze.}, booktitle = {Geometrie Bd. 2}, series = {GDML\_Books}, year = {1968}, pages = {112}, url = {http://dml.mathdoc.fr/item/PPN37649882X+dmdlog64} }
(éd.). Die Tissotschen Sätze., dans Geometrie Bd. 2, GDML_Books, (1968), p. 112. http://gdmltest.u-ga.fr/item/PPN37649882X+dmdlog64/