^L. de Bonis. A new species of Adelpharctos (Mammalia, Carnivora, Ursidae) from the late Oligocene of the "Phosphorites du Quercy" (France). Estudios Geológicos. 2011, 67 (2): 179–186. doi:10.3989/egeol.40553.181.
^ 2.02.12.22.32.4Louis De Bonis. Ursidae (Mammalia, Carnivora) from the Late Oligocene of the "Phosphorites du Quercy" (France) and a reappraisal of the genus Cephalogale Geoffroy, 1862. Geodiversitas. 2013, 35 (4): 787–814. doi:10.5252/g2013n4a4.
Louis De Bonis. Ursidae (Mammalia, Carnivora) from the Late Oligocene of the "Phosphorites du Quercy" (France) and a reappraisal of the genus Cephalogale Geoffroy, 1862. Geodiversitas. 2013, 35 (4): 787–814. doi:10.5252/g2013n4a4.