{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"The theory of general relativity and gravitation; based on a course of lectures delivered at the Conference on recent advances in physics held at the University of Toronto, in January, 1921","author_name":"Ludwik Silberstein","thumbnail_url":"https://www.ebooknetworking.net/books/117/771/big1177711060.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1177711060.html\">The theory of general relativity and gravitation; based on a course of lectures delivered at the Conference on recent advances in physics held at the University of Toronto, in January, 1921</a>","width":400,"height":300}