Russian and French manuscripts, notes, bibliographical material, and transcriptions of early sources for the study of St. Maxim the Greek, about whom Denissoff wrote a prize-winning book, Maxime le Grec et l'Occident, contribution à l'histoire de la pensée religieuse et philosophique de Michel Trivolis (Paris: Desclée, de Brouwer, 1943), with a small quantity of material having to do with his other books and research.