1. Occlusion;Ash,1995
2. Philosophy of occlusion: Past and present;Ash;Dental Clinics of North America,1995
3. Influence of sagittal inclination of the teeth and the orientation of the occlusal plane on mesial drift in the dental arch;Orthlieb;L’Orthodontie Francaise,2000
4. The six keys of normal occlusion;Andrews;American Journal of Orthodontics and Orthopedics,1972
5. The straight-wire appliance: Origin, controversy, commentary;Andrews;Journal of Clinical Orthodontics,1976