@article{GDZPPN002273810, title = {On the Structure of Sets of Points of Classes One, Two and Three}, journal = {Mathematische Annalen}, volume = {102}, year = {1930}, pages = {624-632}, zbl = {55.0055.02}, url = {http://dml.mathdoc.fr/item/GDZPPN002273810} }
Blue, A.H. On the Structure of Sets of Points of Classes One, Two and Three. Mathematische Annalen, Tome 102 (1930) pp. 624-632. http://gdmltest.u-ga.fr/item/GDZPPN002273810/