TY  - BOOK
AU  - Guba V.
AU  - Sapir M.
TI  - Diagram Groups
U1  - MAMS 
PY  - 1997///
CY  - Providence
PB  - Amer. Math. Soc.
N1  - Memoirs of the Amer. Math. Soc., Vol. 130, N 620
ER  -