1. Developmental anatomy;Arey,1965
2. Signaling gradients during paraxial mesoderm development;Aulehla;Cold Spring Harb Perspect Biol,2010
3. Some experimental data to support the theory of resegmentation in vertebral formations;Bagnall;Anat Rec,1987
4. Comparative embryology;Ballard,1964
5. Frazer's manual of embryology;Baxter,1953