TY  - DATA
AU  - Chernoff, Paul R.
TI  - Product formulas, nonlinear semigroups, and addition of unbounded operators
T2  - Memoirs of the American Mathematical Society, 
SN  - 9780821899403 (online)
PY  - 1974///
CY  - Providence
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0140
ER  -