ARTnews's Robin Cembalest responds to Norman Rosenthal's call for an end to any further Nazi restitution claims:
"[T]he fact remains that restitution research is very much a work in process. As ARTnews has chronicled repeatedly over the last two decades, initial efforts to research the history of supposedly 'heirless' art ... were met with stonewalling, obfuscation, and legal obstacles. Only now are closed archives being opened and some European governments showing a willingness to investigate the provenance of works in national collections. The result is a stream of new information about looted art."