TY  - BOOK
AU  - Higgins,Philip J.
TI  - Notes on categories and groupoids
T2  - Van Nostrand Reinhold mathematical studies, 32
SN  - 442034067
U1  - 512.55 HIG 
PY  - 1971///]
CY  - London, New York
PB  - Van Nostrand Reinhold
KW  - Groupoids
KW  - Categories (Mathematics)
N1  - On spine: Categories and groupoids; Bibliography: p. 173-174
ER  -