Affiliation: | 1. Uzhgorod Branch of Institute of Nuclear Research, 284 00, Uzhgorod, Ukraine, USSR 2. Department of Theoretical Physics, Uzhgorod State University, Oktyabrskaya 32, Uzhgorod, Ukraine, USSR 3. Department of Theoretical Physics and Geophysics, P. J. ?afarik University, Komenského 14, 041 54, Ko?ice, Czech and Slovak Federative Republic 4. Department of Physics, P. J. ?afarik University, 17 novembra, 080 09, Pre?ov, Czech and Slovak Federative Republic
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