1. N.S. Nishioka, R.R. Anderson: Gastrointest. Endosc.32, 157 (1986)
2. G.M. Watson, S.L. Jacques, S.P. Dretler, J.A. Parrish: Lasers Surg. Med.5, 160 (1985)
3. S.P. Dretler, G.M. Watson, S.C. Murray, J.A. Parrish: Lasers Surg. Med.6, 191 (1986)
4. S.E. Silvis, J.E. Siegel, R. Hughes, R.M. Katon, C.E. Sievert, M.V. Sivak: Gastrointest. Endosc.32, 155 (1986)
5. R.C. Weast: CRC Handbook of Chemistry and Physics 66th edn. (CRC Press, Boca Raton, FL 1985)