TY  - BOOK
AU  - Gray,Brayton
TI  - Homotopy theory: an introduction to algebraic topology 
SN  - 0122960505 :
U1  - 512.86 
PY  - 1975///
CY  - New York
PB  - Academic Press
KW  - Homotopy theory
KW  - Mathematics
N1  - Bibliography: p. 360-362
ER  -