RUDOLPH, COLIN D. 312.834 RUDOLPH COLIN D., WINTER HARLAND S. NASPGN [North American Society for Pediatric Gastroenterology and Nutrition] guidelines for training in pediatric gastroenterology / Colin D. Rudolph, Harland S. Winter and contributing authors. - Philadelphia : Lippincott Williams and Wilkins, 1999. - [2], 27 s. ; 28 cm. -(JPGN Journal of Pedriatric Gastroenterology and Nutrition, ISSN 277 - 2116 ; vol.29, supp1.1)