G. Klöppel (G. Kloppel / Kloppel, G. / Klöppel, G.)

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  Atlas of Pancreatic Exocrine Tumors : Morphology, Biology, and Diagnosis, with an International Guide for Tumor Classification
  by P. M. Pour
  Hardcover, Springer, ISBN 038770129X (0-387-70129-X)
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  Carcinoid Tumors: International Symposium on Pathology, Epidemiology, Clinical Aspects and Therapy January 13-16, 1994 Munich, Germany
  by G. Kloppel, M. Rothmund, R. Arnold
  Softcover, S Karger Pub, ISBN 3805561210 (3-8055-6121-0)
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  via
  Histological Typing of Tumours of the Exocrine Pancreas
  by L.H. Sobin, G. Kloppel, C. Capella, Daniel S. Longnecker, E. Solcia
  Softcover, Springer Verlag, ISBN 3540602801 (3-540-60280-1)