@article{PPN588764140+DMDLOG_0020, title = {Paper XX. Observatio Geometrica.}, booktitle = {The collected mathematical papers of Henry John Stephen Smith Vol. 1}, series = {GDML\_Books}, publisher = {Clarendon Press}, address = {Oxford}, year = {1894}, pages = {541}, url = {http://dml.mathdoc.fr/item/PPN588764140+DMDLOG_0020} }
(éd.). Paper XX. Observatio Geometrica., dans The collected mathematical papers of Henry John Stephen Smith Vol. 1, GDML_Books, (1894), p. 541. http://gdmltest.u-ga.fr/item/PPN588764140+DMDLOG_0020/