1. Semiquantitative interference study of fatty layer of precorneal film.;Norn;Acta Ophthalmol,1979
2. The Dry Eye: A Comprehensive Guide.;Norn,1992
3. Reflectometry of the precorneal film.;Olsen;Acta Ophthalmol,1985
4. The Pre-Ocular Tear Film in Health, Disease and Contact Lens Wear.;Guillon,1986
5. Contact Lens Practice.;Guillon,1994