TY  - BOOK
AU  - Hartkamper, A..
TI  - Structure and Approximation in Physical Theories / 
SN  - 0 306 40882 1
U1  - C(B114) 
PY  - 1974///
CY  - New York : 
PB  - Plenum Press , 
KW  - Physics
ER  -