{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"The Variational Principles of Mechanics (Dover Books on Physics & Chemistry) by Lanczos. Cornelius ( 1986 ) Paperback","author_name":"","thumbnail_url":"https://www.ebooknetworking.net/books/B00/GSD/bigB00GSD5SC8.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B00GSD5SC8.html\">The Variational Principles of Mechanics (Dover Books on Physics &amp; Chemistry) by Lanczos. Cornelius ( 1986 ) Paperback</a>","width":400,"height":300}