DONAL, IP. Is 24h ambularoty oesophageal pH monitoring useful in a distric general hospital. Lancet. 1987, 8524, 89-92
SAVARY, M. The esophagus. Handbook and atlas of endoscopy. 1978, 135
KAHRILAS, PJ. American gastroenterological association medical position statement; Guidelines on the use of esophageal pH recvording. Gastroenterology. 1996, 110, 1987-1996
JOHNSSON, F. Reproducibility of ambulatory oesophageal pH monitoring. Gut. 1988, 29, 886-889