1. A longitudinal study of untreated Class II type malocclusions;Fröhlich;Trans Eur Orthod Soc,1961
2. Skeletal contributions to occlusal development;Moyers,1977
3. Prediction of first molar occlusion;Arya;Am J Orthod,1973
4. Changes in the molar relationship between the deciduous and permanent dentitions: a longitudinal study;Bishara;Am J Orthod Dentofac Orthop,1988
5. Longitudinal assessment of Class II occlusal and skeletal development in the deciduous dentition;Varrela;Eur J Orthod,1993