1. Prosthodontic treatment for edentulous patients;Zarb,2003
2. Oral Histology. Development, structure, and fundamentals;Nanci,1998
3. Anatomy and physiology of the edentulous mouth;Mohl;Dent Clin North Am,1977
4. The thickness and hardness of soft tissues. A preliminary clinical survey;Tomlin;Br Dent J,1968
5. Viscoelastic properties of the periodontal ligament and mucous membrane;Picton;J Prosthet Dent,1978