{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"The Early Period of the Calculus of Variations","author_name":"Paolo Freguglia, Mariano Giaquinta","thumbnail_url":"https://www.ebooknetworking.net/books/331/938/big3319389440.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-3319389440.html\">The Early Period of the Calculus of Variations</a>","width":400,"height":300}