1. Orthofocus techniques.;Jessen;Contacto,1962
2. Emmetropization through contact lenses.;Neilson;Contacto,1964
3. Orthokeratology: Part I.;Ziff;J Am Optom Assoc,1968
4. Orthokeratology: Part II.;Ziff;J Am Optom Assoc,1968
5. Approach to orthokeratology.;Nolan;J Am Optom Assoc,1969