Olson, S.L., 2000. Countdown to Piltdown at National Geographic. Backbone 13 (2), Apr 2000: 1-3. ≡
|
Olson, S.L. & David, N., 2014. The gender of the tortoise genus Chelonoidis Fitzinger, 1835 (Testudines: Testudinidae). Proc. Biol. Soc. Wash. 126 (4): 393-394.
|