Originally scheduled to be published in three volumes, but only volume 1 has appeared to date. A new online catalogue raisonné of the paintings, which will update Volume 1 of the Winkler and Erling catalogue raisonné, is scheduled to launch in 2017. This project is being compiled under the direction of Katharina Erling and Walter Feilchenfeldt. The second print volume, sponsored by the Fondation Oskar Kokoschka, is currently in preparation by Katharina Erling.