2Metz HS.Double elevator palsy.J Pediatr Ophthalmol Strabismus.1981,18(2):31-5
3Ziffer AJ,Rosenbaum AL,Demer JL,Yee RD.Congenital double elevator palsy:vertical saccadic velocity utilizing the scleral search coil technique.J Pediatr Ophthalmol Strabismus.1992,29(3):142-9
4Mather TR,Saunders RA Congenital absence of the superior rectus muscle:a case report.J Pediatr Ophthalmol Strabismus.1987; 24(6):291-5
5Callahan MA.Surgically mismanaged ptosis associated with double elevator palsy.Arch Ophthalmol.1981 Jan; 99(1):108-12
6Caldeira JA.Vertical transposition of the horizontal rectus muscles for congenital/arly onset "acquired" double elevator palsy:a retrospective long term study of 10 consecutive patients.Binocul Vis Stabismus,2000,15(1):29-38
7JP Burke,JB Ruben,WE Scott.Vertical transposition of the horizontal recti (Knapp procedure) for the treatment of double elevator palsy:effectiveness and long-term stability.British Joumal of Ophthalmology,1992(76)734-737
8Kocak-Altintas AG,Kocakkkk-Midillioglu l,Duman S.Selective management of double elevator palsy by eitherior recession and/or knapp type transposition surgery.Binocul Vis Strabismus Q.2000Spring; 15(1):39-46
