{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Het Probleem Van Pfaff In Verband Met De Theorie Der Partieele Differentiaal Vergelijkingen (1908) (Dutch Edition)","author_name":"Eduard August Steinmetz","thumbnail_url":"https://www.ebooknetworking.net/books/116/049/big1160496781.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1160496781.html\">Het Probleem Van Pfaff In Verband Met De Theorie Der Partieele Differentiaal Vergelijkingen (1908) (Dutch Edition)</a>","width":400,"height":300}