{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Selected Research Papers (Classics of Soviet Mathematics)","author_name":"L.S. Pontryagn","thumbnail_url":"https://www.ebooknetworking.net/books/288/124/big2881241050.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-2881241050.html\">Selected Research Papers (Classics of Soviet Mathematics)</a>","width":400,"height":300}