By Sansaturio M.E.   Vigo-Aguiar I.   Ferrandiz J.M.   in Journal of Differential Equations

ISSN:0022-0396|143|1|147-150

Academic Press‎(1998)‎

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By Barkin Yu. V.   Ferrandiz J. M.   in Astronomical and Astrophysical Transactions

ISSN:1055-6796|23|4|369-384

Taylor & Francis Ltd‎(2004)‎

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