TY  - BOOK
AU  - Bureau of Indian Standards
TI  - IS: 3231 (Part 3/Sec. 5) - 1987 (Reaffirmed 1992); Specification for electrical relays for power system protection Part 3 requirements for particular group of relays Section 5 Impedance measuring relays
PY  - 1987///
CY  - New Delhi
PB  - BIS
ER  -