1. The modular principle and biological form;Waddington,1966
2. Critical periods in organizational processes;Scott,1986
3. Biological rationale for early treatment of dentofacial deformities;Carlson;Am J Orthodont Dentofac Orthop,2002
4. Factors controlling skeletal morphogenesis;van Limborgh,1982
5. A critical and sensitive period primer;Bruer,2001