https://openlibrary.org/books/OL11457351M.opds Ramanujan 2022-12-04T17:52:49Z G. H. Hardy https://openlibrary.org/authors/OL20865A/G._H._Hardy Chelsea Pub Co June 1978 3rd edition https://openlibrary.org/books/OL11457351M https://archive.org/details/ramanujantwelvel0000hard urn:ISBN:0828401365 urn:ISBN:9780828401364 4581435