{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Calculus of variations (University mathematical texts)","author_name":"J. C Clegg","thumbnail_url":"https://www.ebooknetworking.net/books/005/001/big0050016210.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0050016210.html\">Calculus of variations (University mathematical texts)</a>","width":400,"height":300}