TY  - BOOK
AU  - Klapper, Jacob.
TI  - Phase-locked and frequency feedback systems ; principles and techniques
T2  - Electrical science series
U1  - 629.8 
PY  - 1972///
CY  - New York
PB  - Academic Press
KW  - Parametrones
KW  - Sistema de control por retroalimentación
ER  -