1. Contact Lens Routine and Practice;Bier,1957
2. Orthokeratology: part 1. The growth and development;Nolan;Optician,1975
3. Orthofocus techniques;Jessen;Contacto,1962
4. Orthokeratology II. A risky and unpredictable treatment for a benign condition;Safir;Surv. Ophthal.,1980
5. Orthokeratology — an alternative to excimer laser?;Phillips;J. Br. Contact Lens Assoc.,1995