Gersdorff, M., & André, M. (1986). A Comparative-study of the Clinical-results Obtained With Plastipore and Ceramic Ossicular Prostheses in Otologic Surgery. Archives of Oto-Rhino-Laryngology, 243(1), 20-23. https://doi.org/10.1007/BF00457901 (Original work published 1986)