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by De Sabbata, Venzo | De Sabbata, Venzo | International School of Cosmology and Gravitation (1981 : Erice, Italy).
by Bhatnagar, Arvind | Livingston, W. C.
by World Scientific Publishing Company.
by Chandrasekhar, S.
by Sengupta, D. P.
by Baaquie, Belal E | Willeboordse, Frederick H.
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