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2. translation from Astrofizika 3, 459-479 (1967)
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4. Avrett, E.H., Hummer, D.G.: Non-coherent scattering II: Line formation with a frequency independent source function. Mon. Not. R. astr. Soc. 130, 295–331 (1965)
5. Bender, C.M., Orszag, S.A.: Advanced Mathematical Methods for Scientists and Engineers. McGraw-Hill, New York (1978)