1. Retroplacement for strabismus;Berens;Amer. Jour. Ophth.,1929
2. Discussion of the results of the operative treatment of glaucoma;Wilmer;Trans. Ophth. Soc. U. Kingdom,1927
3. Personal communication, October 2, 1935.
4. Forceps for use in surgical operations on the ocular muscles;Berens;Arch. of Ophth.,1935
5. Resection operation for strabismus;Berens;Arch. of Ophth.,1932