{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Variational Principle of Extremum in Electromechanical Systems","author_name":"Solomon I. Khmelnik","thumbnail_url":"https://www.ebooknetworking.net/books/141/163/big141163344X.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-141163344X.html\">Variational Principle of Extremum in Electromechanical Systems</a>","width":400,"height":300}