TY  - DATA
AU  - Rimlinger, Frank
TI  - Pregroups and Bass-Serre theory 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9781470407773 (online)
PY  - 1987///
CY  - Providence, R.I., USA
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0361
ER  -