In his book "The Non-Existent Manuscript. A Study of the Protocols of the Sages of Zion", Italian researcher Cesare De Michelis writes that the hypothesis of Golovinski's authorship was based on a statement by Princess Catherine Radziwill, who claimed that she had seen a manuscript of the Protocols written by Golovinsky, Rachkovsky and Manusevich in 1905, but in 1905 Golovinsky and Rachkovsky had already left Paris and moved to Saint-Petersburg. Princess Radziwill was known to be an unreliable source. Also, the protocols had been mentioned already in the press in 1902.