1. History of refractive surgery;Assil,1994
2. Development of refractive keratotomy in the nineteenth century;Schimmelpfennig,1992
3. A suggestion of an operation to correct astigmatism;Bates;Arch Ophthalmol,1894
4. Experimentelle untersunchungen uber entstehung von astigmatismus durch nicht-per-forrirende corneawunden;Lans;Albrecht Von Graefes Arch Ophthalmol,1898
5. Treatment of conical cornea (incision of Descemet's membrane);Sato;Acta Soc Ophthalmol Jpn,1939