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2. V. A. Ambartsumyan andG. S. Saakyan, Astron. Thur.37, 193, 1960; ibid.V. A. Ambartsumyan andG. S. Saakyan, Astron. Thur.38, 1016, 1961. See also: Soviet Astron. A. M.,8, 186, 1960; ibidV. A. Ambartsumyan andG. S. Saakyan, Astron. Thur.5, 779, 1962.
3. L. Gratton andG. Szamosi, Frascati preprint, 1963.
4. G. Marx, Nuclear Physics,1, 660, 1956.
5. G. Marx. Acta Phys. Hung.,6, 48, 1955.