TY  - BOOK
AU  - SPIEGEL ,M.R.
TI  - Theory and problems of calculus of finite differences and difference equations
SN  - 070602182
U1  - MATH 515.35&.62076 
PY  - 1971///
CY  - New York
PB  - Mcgraw-Hill
KW  - DIFFERENTIAL EQUATIONS
N1  - Including 420 solved problem
ER  -