Varshni,Y.P.: 1978, Astrophys.Space Sci., 56, 385.
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The Inglis-Teller relation, generalized for a hydrogen-like or alkali-like ion with an arbitrary core charge, is used to estimate the electron density in the emission-line region of Wolf-Rayet stars. It is found that the electron density in the region which gives rise to He II emission lines is about 4 X 10^14 cm^-3.