{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Lectures Of The Calculus Of Variations (1904)","author_name":"Oskar Bolza","thumbnail_url":"https://www.ebooknetworking.net/books/054/876/big0548769958.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0548769958.html\">Lectures Of The Calculus Of Variations (1904)</a>","width":400,"height":300}