{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Calculus of Variations (Problem Solvers)","author_name":"J.W. Craggs","thumbnail_url":"https://www.ebooknetworking.net/books/004/517/big0045170096.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0045170096.html\">Calculus of Variations (Problem Solvers)</a>","width":400,"height":300}