[1]
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[2] Fang L.Z, Sato H., Gen.Rel.Grav. 17(1985)1117.
[3] Ap.J.,248(1981), L57-L60.
[4] E.H.Avrett, Frontiers of Astrophysics 1976, p527
[5] C.W.Allen, Astrophysical Quantities, 1973, 135 and 136.
[6] E.H.Avrett, Frontiers of Astrophysics, 1976, p509.
[7] Kenneth R.Lang, Astrophysical Formulae, 1974, Fig. 35.
[8] A.Hewite and G.Burbidge, Ap.J.,43(1980),57-158.