{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"The Variational Principles of Mechanics (Dover Books on Physics)","author_name":"Cornelius Lanczos","thumbnail_url":"https://www.ebooknetworking.net/books/048/665/big0486650677.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0486650677.html\">The Variational Principles of Mechanics (Dover Books on Physics)</a>","width":400,"height":300}