TY  - BOOK
AU  - Arkowitz M
AU  -  Curjel C R
TI  - Groups of homotopy classes: rank formulas and homotopy commutativity
T2  - Lecture notes in the mathematics: A collection of informal reports and seminars
U1  - B27, K73 
PY  - 1967///
CY  - Berlin
PB  - Springer Verlag        
KW  - Mathematics
ER  -