{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Variational Principles and Free-Boundary Problems (Dover Books on Mathematics)","author_name":"Avner Friedman, Mathematics","thumbnail_url":"https://www.ebooknetworking.net/books/048/647/big048647853X.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-048647853X.html\">Variational Principles and Free-Boundary Problems (Dover Books on Mathematics)</a>","width":400,"height":300}