References
- Lysholm and Erik (1931) Apparatus and Technique for Roentgen Examination of the scull. Acta Rad
- Runstrom and Gosta A Roentgenological Study of Acute and Chronic Otitis Media. Acta Rad
- Ebenius and Bertil The Results of the Examination of Petrous Bone in Auditory nerve Tumors. Acta Rad, p. Fasc. 3, N:o 85.