James M. Stayer, Werner O. Packull, and Klaus Deppermann disputed the idea of a single origin of Anabaptists in a 1975 essay entitled "From Monogenesis to Polygenesis", suggesting that February 24, 1527, at Schleitheim is the proper date of the origin of Anabaptism. On this date the Swiss Brethren wrote a declaration of belief called the Schleitheim Confession. The authors of the essay noted the agreement among previous Anabaptist historians on polygenesis, even when disputing the date for a single starting point: "Hillerbrand and Bender (like Holl and Troeltsch) were in agreement that there was a single dispersion of Anabaptism ..., which certainly ran through Zurich. The only question was whether or not it went back further to Saxony." After criticizing the standard polygenetic history, the authors found six groups in early Anabaptism which could be collapsed into three originating "points of departure": "South German Anabaptism, the Swiss Brethren, and the Melchiorites". According to their polygenesis theory, South German–Austrian Anabaptism "was a diluted form of Rhineland mysticism", Swiss Anabaptism "arose out of Reformed congregationalism", and Dutch Anabaptism was formed by "Social unrest and the apocalyptic visions of Melchior Hoffman". As examples of how the Anabaptist movement was influenced from sources other than the Swiss Brethren movement, mention has been made of how Pilgram Marpeck's of 1542 was deeply influenced by the of 1533 by Münster theologian Bernhard Rothmann. Melchior Hoffman influenced the Hutterites when they used his commentary on the Apocalypse shortly after he wrote it.