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机构:
Bogolyubov Inst Theoret Phys, Metrol St 14-B, UA-03143 Kiev, Ukraine
Taras Shevchenko Natl Univ Kiev, Astron Observ, Observatorna St 3, UA-04053 Kiev, Ukraine Univ Nottingham, Sch Math Sci, Univ Pk, Nottingham NG7 2RD, England