TY  - BOOK
AU  - Bureau of Indian Standards
TI  - IS: 3231 (Part 2/Sec. 1) - 1987; Specification for electrical relays for power system protection Part 2 requirements for principal families Sec. 1 all-or-nothing relays
PY  - 1988///
CY  - New Delhi
PB  - BIS
ER  -