1. An unusual hamartoma of the pigment epithelium and retina simulating choroidal melanoma and retinoblastoma;Gass;Trans. Am. Ophthalmol. Soc.,1973
2. Hamartoma of the retinal pigment epithelium Am;McLean;J. Ophthalmol.,1976
3. Proliferation of the juxtapapillary pigment epithelium simulating malignant melanoma;Vogel;Doc. Ophthalmol.,1969
4. Die Proliferation des juxtapapillären retinalen Pigmentepithels;Vogel;Klin. Monatsbl. Augenheilkd.,1973
5. Die primäre retinale Pigmentepithelhyperplasie. Albrecht von Graefes Arch;Machemer;Klin. Ophthalmol.,1964