https://www.theartnewspaper.com/preview/east-german-arseholes-are-reappraised

https://www.nytimes.com/2018/04/06/arts/design/russian-avant-garde-art-forgery-disputes.html

https://www.nytimes.com/2018/03/04/arts/mondrians-heirs-stake-claim-to-four-paintings-in-a-german-museum.html

https://www.nytimes.com/2017/07/26/arts/design/after-26-years-munich-settles-case-over-a-klee-looted-by-nazis.html

  Do I have Nazi-looted art? German collectors seek answers