Ketchum, H. F.; Barrett, P. M. (2004). "New reptile material from the Lower Triassic of Madagascar: implications for the Permian–Triassic extinction event". Canadian Journal of Earth Sciences. 44 (1): 1–8. Bibcode:2004CaJES..41....1K. doi:10.1139/e03-084.
Ketchum, H. F.; Barrett, P. M. (2004). "New reptile material from the Lower Triassic of Madagascar: implications for the Permian–Triassic extinction event". Canadian Journal of Earth Sciences. 44 (1): 1–8. Bibcode:2004CaJES..41....1K. doi:10.1139/e03-084.