12. Sheedy JE, Parsons SP. Vertical yoked prism - patient acceptance and postural adjustment. Ophthalmic and Physiological Optics 7: 255-257, 1987.

12. Sheedy JE, Parsons SP. Vertical yoked prism - patient acceptance and postural adjustment. Ophthalmic and Physiological Optics 7: 255-257, 1987.