He also argues that the archaeology suggests that the return was a "trickle", taking place over perhaps decades, resulting in a maximum population of perhaps 30,000.[12] Philip R. Davies called the authenticity of the decree "dubious", citing Grabbe and adding that J. Briend argued against "the authenticity of Ezra 1.1–4 is J. Briend, in a paper given at the Institut Catholique de Paris on 15 December 1993, who denies that it resembles the form of an official document but reflects rather biblical prophetic idiom."[13] Mary Joan Winn Leith believes that the decree in Ezra might be authentic and along with the Cylinder that Cyrus, like earlier rules, was through these decrees trying to gain support from those who might be strategically important, particularly those close to Egypt which he wished to conquer.