The system of four forms, of which two are linear and two quadratic, has been investigated by Perrin (S.
5 2 9-55 2); Perrin (S.
Amongst books dealing with the more modern history of the Vaudois specially are Leger, Histoire des eglises vaudoises; Arnaud, Histoire de la rentree des Vaudois; Perrin, Histoire des Vaudois; Monastier, Histoire de l'eglise vaudoise; Muston, L' Israel des Alpes; Gilly, Excursion to the Valleys of Piedmont, and Researches on the Waldensians; Todd, The Waldensian Manuscripts; Melia, Origin, Persecution and Doctrines of the Waldensians; Jules Chevalier, Memoires sur les heresies en Dauphine avant le X VP siecle, accompannes de documents inedits sur les sorciers et les Vaudois (Valence, 1890); J.
Perrin and G.
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