The Centrum voor Teksteditie en Bronnenstudie (Centre for Text Edition and Information Research) in Gent (Belgium) maintaines a website for the Flemish magazine Van Nu en Straks, which was issued between 1893 and 1901.
In January 1894, Ricketts published a drawing that was later used as the closing illustration for Oscar Wilde's The Sphinx in Van Nu en Straks. The book was published a few months later.
|Charles Ricketts, illustration for Oscar Wilde, The Sphinx (1894) [detail]|
Letters concerning the illustration were published in a book on the genesis of the magazine, Het ontstaan van "Van nu en straks". Een brieveneditie 1890-1894 (Antwerp, 1988). The letters can be searched and consulted for Ricketts references online.