1. Vitreo-retinal and anterior segment surgery through the pars plana;Michels;Ann. Ophthalmol.,1976
2. Coleman, D. J.: Vitrectomy in diabetic retinopathy. Presented at the Annual J. Gonin Club Meeting, Barcelona, Spain, Oct. 4, 1978.
3. Ophthalmologic effect of ultrasound at diagnostic intensities;Ziskin;J. Clin. Ultrasound,1974
4. Safety factors of pulsed ultrasonic irradiation;Barnett,1977
5. Therapeutic ultrasound in the production of ocular lesions;Coleman;Am. J. Ophthalmol.,1978