1) Hilgers, F. J., Ackerstaff, H. A., Balm, A. J. M., et al. : Development and clinical evaluation of a secondgeneration voice prosthesis (Provox®2) : Designed for anterograde insertion. Acta Otolaryngol., 117 : 889-896, 1997.
2) Hilgers, F. J. : A Practical Guide to Post-Laryngectomy Rehabilitation Including the Provox® System 4th edition : 3. Surgical procedure. Primary prosthetic voice rehabilitation. The Netherland Cancer Institute, pp. 14-18, 2003.
4) Hilgers, F. J. : A Practical Guide to Post-Laryngectomy Rehabilitation Including the Provox® System 4th edition : 3. Surgical procedure. Secondary prosthetic voice rehabilitation. The Netherland Cancer Institute, pp. 19-23, 2003.