The first writing I could find on the Codex was an essay in "Metamagical Themas: Questing for the Essence of Mind and Pattern," a 1985 book by Pulitzer Prize-winning author Douglas Hofstadter ...
The Codex Sassoon is named after the book collector David Solomon Sassoon, who acquired it in 1929 for 350 British pounds, the equivalent of about $28,000 today, when it resurfaced after 600 years.