{"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 Differentiaalvergelijkingen","author_name":"Eduard August Steinmetz","thumbnail_url":"https://www.ebooknetworking.net/books/111/300/big111300780X.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-111300780X.html\">Het Probleem van Pfaff in verband met de Theorie der Partieele Differentiaalvergelijkingen</a>","width":400,"height":300}