Fullformexpand.com, 2026. "SARFI." Accessed February 22, 2026. https://www.fullformexpand.com/sarfi/system-average-rms-variation-frequency-index.
"SARFI." (n.d.). Fullformexpand.com. Retrieved February 22, 2026, from https://www.fullformexpand.com/sarfi/system-average-rms-variation-frequency-index.
SARFI. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/sarfi/system-average-rms-variation-frequency-index (Accessed: 22 February 2026).