1. Kapany N.S., Silbertrust N., Fiber optics spectrophotometer for in-vivo oximetry, Nature 1964; 208:138.
2. Falciai R., Scheggi A.M., Baldini F., and Bechi P., U.S.A. Patent 4,976,265 (1990).
3. Falciai R., Baldini F., Cosi F., Bechi P., Pucciani F., Bile enterogastric reflux sensor using plastic optical fibres, Fiber andlntegr. Opt. 1993; 12: 215.
4. Cecchi srl, Viadotto Indiano 50145, Firenze, Italy.
5. Medtronic Functional Diagnostics, Tonsbakken 16–18, Skovlunde, Denmark, http://www.mfd.medtronic.com.