1. Endoscopic cannulation of the ampulla of Vater;Gregg;Am J Gastroenterol,1973
2. The effects of secretin on pancreatic juice flow rates as measured during endoscopic cannulation of the main pancreatic duct;Gregg,1975
3. Gregg JA: Concentrations of bicarbonate in pancreatic juice obtained during endoscopic cannulation of the pancreatic duct and from aspiration of duodenal contents after secretin administration: Observations in 200 patients.
4. The clinical significance of pancreas divisum;Rösch;Gastrointest Endosc,1976
5. Gregg JA: Endoscopic retrograde pancreatography in patients with pancreatitis. Observations in 360 patients.