1. Burian, H. M.: Strabismus Ophthalmic Symposium II. Allen, J. H. (ed.), St. Louis, Mosby, 1958, p. 488.
2. Cyclic esotropia;Costenbader;Arch. Ophth.,1964
3. Clock-mechanism esotropia in children: Alternate-day squint;Richter;Johns Hopkins Med. J.,1968
4. Alternate day squint. Transactions of the First International Congress of Orthoptics;Roper-Hall,1968
5. Cyclic esotropia;Chamberlain;Am. Orthoptic J.,1968