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Dyfyniad Arddull ChicagoWilliams, I. P., Ashok Ambastha, B. G. Anandarao, and T. Chandrasekhar. Astrophysical Problems: A Dynamical Approach. Ahmedabad: Physical Research Laboratory, 1981.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.