The formula for the GMR was taken from the book Electric Power Generation, Transmission, and Distribution by Leonard L. Grigsby (2006).

Symbol
$GMR$
Unit
mm
Formulae
$K_{\mathrm{GMR}} r_{\mathrm{c}}$
Related
$K_{\mathrm{GMR}}$
$r_{\mathrm{c}}$
Used in
$GMD$
$L_{\mathrm{1}}$
$L_{\mathrm{2}}$
$L_{\mathrm{3}}$
$L_{\mathrm{m}}$
$X_{\mathrm{s}}$