1. A buried muscle cone implant – development of a tunneled hemispherical type;Allen;Arch. Ophthalmol,1950
2. Fitting the ocular prosthesis: a challenge;Allen;Trans. Am. Acad.Ophthalmol. Otolaryngol.,1970
3. The argument against imbricating the rectus muscles over spherical orbital implants after enucleation;Allen;Ophthalmology,1983
4. A quasi-integrated buried muscle cone implant with good motility and advantages for prosthetic fitting;Allen;Trans. Am. Acad. Ophthalmol. Otolaryngol.,1960
5. Modified impression method of artificial eye fitting;Allen;Am. J. Ophthalmol.,1969