TY  - DATA
AU  - Gordon, Robert
TI  - G-categories 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9781470400590 (online)
PY  - 1993///
CY  - Providence, R.I.
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0482
ER  -