1. Strohm WD, Philip J, Hagenmuller F et al. Ultrasonic tomography by means of an ultrasonic fiberendoscope. Endoscopy. 1980;12:241–244.
2. DiMagno EP, Buxton JL, Regan PT et al. Ultrasonic endoscope. Lancet. 1980;1:629–631.
3. Wiersema MJ, Chak A. Prospective comparative evaluation of a linear electronic array ultrasound endoscope and a radial mechanical ultrasound endoscope. Gastrointest Endosc. 1993;39:51A (Abstract).
4. Rösch T, Dittler HJ, Kunte M, Höfler H, Siewert JR, Classen M. Comparison of a sector-type with a linear-type echoendoscope in the staging of GI cancer. Gastrointest Endosc. 1994;40:69 (Abstract).
5. Gress F, Chen YK, Sherman S et al. Experience with a catheter-based ultrasound probe in the bile duct and pancreas. Endoscopy. 1995;27:178–184.