@article{1183494781, author = {Wong, B. C.}, title = {On the number of apparent double points of $r$-space curves}, journal = {Bull. Amer. Math. Soc.}, volume = {37}, number = {12}, year = {1931}, pages = { 421-423}, language = {en}, url = {http://dml.mathdoc.fr/item/1183494781} }
Wong, B. C. On the number of apparent double points of $r$-space curves. Bull. Amer. Math. Soc., Tome 37 (1931) no. 12, pp. 421-423. http://gdmltest.u-ga.fr/item/1183494781/