1. Measurements of normal attic and tympanic cavity using polytome;Tanaka;J Otolaryngol Jpn,1980
2. Measurements of the size of normal aditus ad antrum and antrum on polytome X-ray films;Goto;J Otolaryngol Jpn,1980
3. Quantitative study of chronic otitis media using polytome;Tanaka;J Otolaryngol Jpn,1981
4. Quantitative study of cholesteatoma using polytome;Goto;J Otolaryngol Jpn,1981