1. Studies of the mammalian dentition. Differentiation of the post-canine dentition;Butler;Proc. Jom. Soc. Lond.,1939a
2. The teeth of the Jurassic mammals;Butler;Proc. Zool. Soc. Lond.,1939b
3. Butler , P. M. 1959 The morphology of the lower molars of mesozoic mammals
4. A half century of trituberculy;Gregory;Proc. Amer. phil. Soc.,1934
5. Tho first mammals;Kermack;Discovery,1959