{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Perturbation theory of eigenvalue problems","author_name":"F Rellich","thumbnail_url":"https://www.ebooknetworking.net/books/129/372/big129372288X.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-129372288X.html\">Perturbation theory of eigenvalue problems</a>","width":400,"height":300}