Margot Van Mulken, «Perceval» and stemmata, Les manuscrits de Chrétien de Troyes. The manuscripts of Chrétien de Troyes, Faux titre, 71-72, Amsterdam;Atlanta, Rodopi, 1993 : p. 41 - 48
IMB 29/1 n° 3107 : The 15 extant MSS. of Chrétien de Troyes's Perceval reveal continuously changing textual relationships, resulting from the fact that medieval scribes felt entitled to adjust the texts copied by them