1. J. Bishop, Experimental researches into the physiology of the human voice, Lond. Edinb. Philos. Mag., J. Sci. (1836).
2. Ueber eine neues laryngostroboskopische Untersuchungsmethode des kehlkopfes;Oertel;Centralblatt Medizinischen Wiss.,1878
3. Das laryngostrobokop und die Laryngostroboskpische untersuchung;Oertel;Arch. Laryngol. Rhinol.,1895
4. Laryngeal vibrations: measurements of the glottic wave. Part III. The pathologic larynx;Leden Hv;Arch. Otolaryngol.,1960
5. The electronic synchron-stroboscope: its value for the practising laryngologist;Leden;Ann. Otol. Rhinol. Laryngol.,1961