1. Rivera, Jose A., Cilia, Ciliated Epithelium and Ciliary Activity Intern. Ser. Mono. Pure and App. Biol. (Pergamon Press, 1962).
2. Viktorow, K., Acta Otolaryngologica, 21, 61 (1934).
3. Engelmann, T. W., Pflügers Arch. ges. Physiol., 15, 493 (1877).
4. Inchley, O., J. Physiol., 54 (1921).
5. Dalhamn, T., Acta Physiol. Scand., 36, Supp. 123 (1956).