TY  - BOOK
AU  - KELLEY Walter G
AU  -  PETERSON Allan C
TI  - Difference equations:  An introduction with applica   
SN  - 012403330X
U1  - B33, P1 
PY  - 2001///
CY  - London
PB  - Academic Press         
KW  - Differentiel and Integral Equation
N1  - Biblliography P 383-399; Appendix P 367-371
ER  -