R. Frass

Presence or absence of gas in the appendix: additional criteria to rule out or confirm acute appendicitis--evaluation with US.

N. Gritzmann, T. Rettenbacher, A. Hollerweger, 2000, Radiology.

Abdominal wall hernias: cross-sectional imaging signs of incarceration determined with sonography.

N. Gritzmann, T. Rettenbacher, A. Hollerweger, 2001, AJR. American journal of roentgenology.

Single incision laparoscopic sigmoid colon resections without visible scar: a novel technique

H. Weiss, W. Brunner, J. Schirnhofer, 2010, Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland.

New: Single-incision transumbilical laparoscopic surgery

H. Weiss, W. Brunner, J. Schirnhofer, 2009, European Surgery.