TY  - BOOK
AU  - Spiegal, Murrary R
AU  - 
TI  - Schaum's outline of theory and problems of calculus of finite differences and difference equations
U1  - 519.91 
PY  - 1971///
CY  - New York
PB  - McGraw-Hill
KW  - Differential equations
KW  - Functional equations
ER  -