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200 1 $aIntroduction to non-linear mechanics$fN. Kryloff, N. Bogoliuboff
210   $aNew York$cKraus reprint$d1970
215   $a106 p.$d23 cm
300   $aRist. dell' ed.: Princeton : Princeton University Press, 1947
700  1$aKryloff,$bN.$0344308
701  1$aBogoliubov,$bNikolai Nikolaevich$0543457
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