{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Introduction to the calculus of variations and its applications (Chapman & Hall Mathematics Series)","author_name":"Frederic Wan","thumbnail_url":"https://www.ebooknetworking.net/books/041/205/big0412051419.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0412051419.html\">Introduction to the calculus of variations and its applications (Chapman &amp; Hall Mathematics Series)</a>","width":400,"height":300}