TY  - BOOK
AU  - Bellman R
AU  -  Wing G M
TI  - Introduction to invariant imbedding
T2  - Pure and applied mathematics
U1  - B9:6, L53-;1 
PY  - 1975///
CY  - New York    
PB  -  John wiley       
KW  - Astronomy
ER  -