Fomum, Z. Tanee; Nkengfack, A. Ephraim; Landor, Stephen R.; Landor, Phyllis D.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1988 , p. 277 - 282
Freundler
Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1903 , vol. 136, p. 1137
Bulletin de la Societe Chimique de France, 1903 , vol. <3>29, p. 743; 33,80
Consonni, Roberto; Dalla Croce, Piero; Ferraccioli, Raffaella; La Rosa, Concetta
Journal of the Chemical Society - Perkin Transactions 1, 1996 , # 15 p. 1809 - 1814