1. Laser triangulation as adopted for measurements of vocal fold level differences. In: editors. Proceedings of the 24th IALP Congress, International Ass. of Logopedics and Phoniatrics. Amsterdam, The Netherlands: Nijmegen University Press; 1998. pp 30-33.
2. New Laser Ruler Instrument for Making Measurements Through an Endoscope
3. High speed imaging combined with laser triangulation for estimations of vocal fold elasticity. In: editors. Proceedings of 5th Conference of Advances in Quantitative Laryngology. Groningen Voice Research Lab., Groningen, The Netherlands. 2001 on CD-ROM.
4. Two-point light projection method for endolaryngeal morphometry. In: editors. Proceedings of 5th Conference of Advances in Quantitative Laryngology. Groningen Voice Research Lab., Groningen, The Netherlands. 2001 on CD-ROM.