1. Beer GR de (1937) Development of the vertebrate skull. Oxford University Press, Oxford (republished: University of Chicago Press, Chicago, 1985)
2. Blechschmidt E (1976a) Principles of biodynamic differentiation. In: Bosma JF (ed) Development of the basicranium. DHEW publication no (NIH) 76-989, pp 54–76
3. Blechschmidt M (1976b) Biokinetics of the developing basicranium. In: Bosma JF (ed) Development of the basicranium. DHEW publication no (NIH) 76-989, pp 44–53
4. Bosma JF (1976) Introduction to the symposium. In: Bosma JF (ed) Development of the basicranium. DHEW publication no (NIH) 76-989, pp 3–28
5. Brown PE, Grinnell AD (1980) Echolocation ontogeny in bats. Animal sonar systems, Plenum Press, New York, p 355–382