@article {Sullivan217, author = {B. H. Sullivan, Jr. and Henry B. Friedman}, title = {Diagnostic medical esophagoscopy}, volume = {34}, number = {4}, pages = {217--224}, year = {1967}, publisher = {Cleveland Clinic Journal of Medicine}, issn = {0891-1150}, URL = {https://www.ccjm.org/content/34/4/217}, eprint = {https://www.ccjm.org/content/34/4/217.full.pdf}, journal = {Cleveland Clinic Journal of Medicine} }