TY  - BOOK
AU  - Green, N.J.B.  .
TI  - Quantum mechanics 2 : the toolkit / 
SN  - 0-19-850227-3
U1  - E 
PY  - 1998///
CY  - New York : 
PB  - Oxford University Press , 
KW  - Perturbations
ER  -