{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Null Curves and Hypersurfaces of Semi-riemannian Manifolds","author_name":"Krishan L. Duggal","thumbnail_url":"https://www.ebooknetworking.net/books/B00/7JI/bigB007JIR2DO.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B007JIR2DO.html\">Null Curves and Hypersurfaces of Semi-riemannian Manifolds</a>","width":400,"height":300}