1. Obliteration of the mastoid cavity;Palva,1986
2. Calculation of hearing results after tympanoplasty;Harder;Clin. Otolaryngol.,1982
3. J. Silvola, Long-term results of middle ear and mastoid surgery in children, Academic dissertation, University of Helsinki, 1997.
4. Treatment of cholesteatoma in children;Tos;Am. J. Otol.,1983
5. Surgery of congenital and acquired cholesteatoma in children;Sanna;Adv. Oto. Rhino. Laryngol.,1988