TY  - BOOK
AU  - Gopal, M.
TI  - Digital Control Engineering
U1  - GOP 
PY  - 1988///
CY  - New York
PB  - John Wiley & Sons
UR  - https://books.google.com.pk/books/about/Digital_Control_Engineering.html?id=ZXfX-nnYiOcC&redir_esc=y
ER  -