1. Bories, S., Fredy, D., Rosier, S.: Neuroradiology 1, 200 (1970).
2. Braun, J.P., Vrousos, C., Wackenheim, A., Baumgartner, J., Chrzanowski, R.: J. belge Radiol. 51, 73 (1968).
3. Corrales, M., Greitz, T.: Acta radiol. Diagn. 12, 113 (1972).
4. Di Chiro, G.: An atlas of detailed normal pneumoencephalographic anatomy, 2nd ed. Springfield, Ill. Thomas 1971.
5. Kadrnda, S., Krompotic, J.: Ann. Radiol. 4, 715 (1963).