1. Cephalometric analyses based on natural head posture of Chinese children in Hong Kong [PhD Thesis];Cooke,1986
2. The role of cephalometrics in orthodontic case analysis and diagnosis;Downs;Am J Orthod,1952
3. Analysis of the dento-facial profile;Downs;Angle Orthod,1956
4. Orientation of profile radiographs and photos intended for publication of case reports;Lundstrom;Proc Finn Dent Soc,1981
5. Head posture in relation to slope of the sella nasion line;Lundstrom;Angle Orthod,1982