1. Bioprogressive Therapy Part 2: Principles of the Bioprogressive therapy;Bench;J Clin Ortho,1977
2. Perspectives in the clinical application of cephalometrics: The first fifty years;Ricketts;Angle Orthod,1981
3. Bioprogressive therapy part 3: Visual treatment objective or VTO;Bench;J Clin Ortho,1977
4. A four step method to distinguish orthodontic changes from natural growth;Ricketts;J Clin Ortho,1975
5. Bioprogressive therapy part 4: The use of superimposition areas to establish treatment design;Bench;J Clin Ortho,1977