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200 1 $aNumerical-analytic methods of investigating periodic solutions$fA. M. Samoilenko, N. I. Ronto$gtranslated from the russian by Vladimir Shokurov
210   $aMoscow$cMir publishers$d1979
215   $a183 p.$d20 cm
606 0 $aEquazioni differenziali
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996   $aNumerical-analytic methods of investigating periodic solutions$91119671
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