TY  - BOOK
AU  - Warrington, A. R. van C.
TI  - Protective relays: their theory and practice 
SN  - 0412090600
U1  - 621.317 
PY  - 1968///
CY  - London
PB  - Chapman & Hall
KW  - Protection engineer
N1  - Includes references & index
ER  -