References

1. Scott AB: Botulinum toxin injection of eye muscles to correct strabismus. Trans Am Ophthalmol Soc 1981; 79:734-770
2. Kraft SP, Lang AE: Cranial dystonia, blepharospasm and hemifacial spasm: clinical features and treatment, including the use of botulinum toxin.Can Med Assoc J 1988; 139: 837-844