1. A combined manometric—pH recording catheter for esophageal function tests;Orringer;Ann. Thoracic Surg.,1978
2. Combined pH and pressure measurements for oesophageal investigations;Ask;Med. Biol. Eng. Comp.,1981
3. A monolithic pressure—pH sensor for esophageal studies;Huang;Int. Elec. Dev. Meeting, Tech. Digest, San Francisco, CA, U.S.A.,1982
4. A pH-ISFET and an integrated pH—pressure sensor with back-side contacts;van den Vlekkert;Sensors and Actuators,1988
5. A novel four-electrode electrochemical etch-stop method for silicon membrane formation;Kloeck;Proc. 4th Int. Conf. Solid-State Sensors and Actuators (Transducers'87), Tokyo, Japan,251987