by Chen, T. Y., Li, W. F., Jun, J. D., Pen, J. H., Chao, J. X.
Published in Materials science and technology (01.07.2010)

by Colemont, L J, Pen, J H, Pelckmans, P A, Degryse, H R, Pattyn, S R, Van Maercke, Y M
Published in The American journal of gastroenterology (01.09.1990)

by Pen, J H, Pelckmans, P A, van Maercke, Y M, Degryse, H R, de Schepper, A M
Published in Gastrointestinal radiology (1986)

by Colemont, L J, Pattyn, S R, Michielsen, P P, Pen, J H, Pelckmans, P A, Van Maercke, Y M, Portaels, F
Published in The Lancet (British edition) (06.02.1988)

by Pen, J H, Pelckmans, P A, Michielsen, P P, Van Maercke, Y M
Published in The New England journal of medicine (22.05.1986)

Published in Gastroenterology (New York, N.Y. 1943) (01.01.1988)