TY  - BOOK
AU  - Bureau of Indian Standards
TI  - IS: 3231 (Part 3/Sec. 1) - 1987 Reaffirmed 1992; Specification for electrical relays for power system protection Part 3 requirements for particular group of relays Section 1 Non-specified time or indepandent specified time measuring relays
PY  - 1987///
CY  - New Delhi
PB  - BIS
ER  -