Security Requirements for Mobile Agents in Electronic Markets. - Michael Zapf; Helge Müller; Kurt Geihs (Trends in Distributed Systems for Electronic Commerce, 1998)

Estimating risk preferences of bettors with different bet sizes. - Eberhard Feess; Helge Müller; Christoph Schumacher (Eur. J. Oper. Res., 2016)