TY  - DATA
AU  - Marsden, Jerrold E.
AU  - Montgomery, R.Ratiu, Tudor S.
TI  - Reduction, symmetry, and phases in mechanics 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9781470408596 (online)
PY  - 1990///
CY  - Providence, R.I., USA
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0436
ER  -