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2. A nomogram for calculating the power of the prepupillary lens in the aphakic eye;Van der Heijde;Bibl Ophthalmol,1975
3. The optical correction of unilateral aphakia;Van der Heijde;Symposium: Intraocular lenses. Trans Am Acad Ophthalmol Otolaryngol,1976
4. A three-dial biometer;Drews;Ophthalmic Surg,1982
5. Intraocular lens power calculation;Binkhorst;Int Ophthalmol Clin,1979