Georgina Adam addresses the confusion in the Modigliani market in the Financial Times with some news that might only add to the confusion:

There are no less than five published catalogues raisonnées of Modigliani work, although just one, by Ambrogio Ceroni, last updated in 1970, is generally accepted by specialists, despite some omissions.

One of the other catalogues is written by Christian Parisot, a French art historian who, through his friendship with Modigliani’s daughter Jeanne Hébuterne, inherited the legal moral right to authenticate his work. Last year Parisot was convicted of faking drawings by Hébuterne. He is appealing but he was recently placed under investigation in a new case, that of counterfeiting certificates of authenticity.

“Parisot is often in Italy and the police took the opportunity of his being in France to question him, and a legal inquiry has been opened,” French policeman Olivier Bricaud, who investigated the earlier case, told me. “Parisot is suspected of faking, and then making a fake certificate for, a Modigliani drawing that subsequently sold for about €80,000.” According to French newspaper Le Figaro, Parisot says the artwork in question is genuine.

The Art Market: Tsar Power (Financial Times)