A valuable book is de Faye, Clem.
De Faye, Introduction a l'etude du Gnosticisme (Paris, 1903); R.
See Laingaeus, De Vita et Moribus (1585, calumnious); Antoine la Faye, De Vita et Obitu (1606, eulogistic); Schlosser, Leben (1806); Baum, Th.
Faye in November 1843, the other by Francesco de Vico a year later, were minutely investigated by Leverrier, with the result of disproving the supposed identity of the first with Lexell's lost comet of 1770, and of the other with Tycho's of 1585.
The latter view is advocated by Ryssel and Ginzberg, the former by Kabisch, de Faye, R.
Many of these conclusions were arrived at independently by a French scholar, De Faye (Les Apocalypses juives, 1892, pp. 25-28, 76-103, 192-204).
Langen, Hilgenfeld, Wieseler, Stahelin, Renan, Hausrath, Drummond, Dillmann, Rosenthal, Gunkel, have maintained on various grounds the priority of 4 Ezra; and Scharer, Bissell, Thomson, Deane, Kabisch, De Faye, Wellhausen, and Ryssel the priority of Baruch on grounds no less convincing.