TY  - JOUR
AU  - A.H. Blue
TI  - On the Structure of Sets of Points of Classes One, Two and Three
JO  - Mathematische Annalen
PY  - 1930
SP  - 624
EP  - 632
VL  - 102
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1930__102_159398/
ID  - MAN_1930__102_159398
ER  -