A Brief History of Dada
https://www.smithsonianmag.com/arts-culture/dada-115169154/
This article from Smithsonian Magazine gives an overview of the literary and artistic movement called Dada (Ionesco's work is thought to have been influenced by Dada).
Sold at Auction: Eugene Ionesco
https://www.invaluable.com/artist/ionesco-eugene-2kfo8e9l63/sold-at-auction-prices/
This website shows images of visual artworks produced by Eugène Ionesco, and lists estimates of what they sold for.
Eugene Ionesco; Godfather of Theater of Absurd
https://www.latimes.com/archives/la-xpm-1994-03-29-mn-39630-story.html
An obituary of Ionesco that was published in the L.A. Times.