{"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) New Edition by Lanczos, Cornelius published by Dover Publications Inc. (1986)","author_name":"","thumbnail_url":"https://www.ebooknetworking.net/books/B00/EKY/bigB00EKYOBQQ.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B00EKYOBQQ.html\">The Variational Principles of Mechanics (Dover Books on Physics &amp; Chemistry) New Edition by Lanczos, Cornelius published by Dover Publications Inc. (1986)</a>","width":400,"height":300}