1. Congenital absence of the superior oblique tendon;Helveston;Trans Am Ophthalmol Soc,1981
2. Vertical abnormal retinal correspondence in three patients with congenital absence of the superior oblique muscle;Matsuo;Am J Ophthalmol,1988
3. Traction testing in superior oblique palsy;Plager;J Pediatr Ophthalmol Strabismus,1990
4. Exaggerated traction test for the oblique muscles;Guyton;Ophthalmology,1981