1. Embryonic Development and Induction;Spemann,1938
2. Biochemistry and Morphogenesis;Needham,1942
3. Embryonic Development and Induction;Spemann,1938
4. Embryonic Development and Induction;Spemann,1938
5. The time relations of determination in early amphibian development;Gilchrist;J. Exper. Zool.,1933