[mnehring]

Without going so far as to pay for the article, it looks like something like you are describing may exist.

Art News from 1968 has a discussion with her about Matisse.

http://pqasb.pqarchiver.com/latimes/access/520905932.html?dids=520905932:520905932&FMT=ABS&FMTS=ABS:AI&type=historic&date=Jan+14%2C+1968&author=&pub=Los+Angeles+Times&desc=ART+NEWS&pqatl=google

[Drango]

I would certainly accept that if it or another article says it was a “study”. Till then it’s the worst plagiarism and you have to wonder why it was hanging in the Smithsonian.