{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Contributions to the Theory of Nonlinear Oscillations, Volume I. (AM-20) (Annals of Mathematics Studies) (v. 1)","author_name":"Solomon Lefschetz","thumbnail_url":"https://www.ebooknetworking.net/books/069/107/big0691079315.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0691079315.html\">Contributions to the Theory of Nonlinear Oscillations, Volume I. (AM-20) (Annals of Mathematics Studies) (v. 1)</a>","width":400,"height":300}