1. Resection operation for strabismus;Berens;Arch. of Ophth.,1932
2. Retroplacement for strabismus;Berens;Amer. Jour. Ophth.,1929
3. Tenon's capsule transplants in surgery of the ocular muscles, with especial reference to postoperative deviations with adhesions between the muscles and the eyeball;Berens;Amer. Jour. Ophth.,1938
4. An untied conjunctival suture and conjunctival bridge in cataract extraction. Results and conclusions;Berens;Brit. Jour. Ophth.,1936