Trust Issues in Shibboleth-Enabled Federated Grid Authentication and Authorization Infrastructures Supporting Multiple Grid Middleware. - Christian Grimm; Ralf Groeper; Siegfried Makedanz; Hans Pfeiffenberger; Peter Gietz; Martin Haase; Michael Schiffers; Wolfgang Ziegler (eScience, 2007)

An Architecture for Authorization in Grids using Shibboleth and VOMS. - Ralf Groeper; Christian Grimm; Stefan Piger; Jan Wiebelitz (EUROMICRO-SEAA, 2007)

A Comprehensive Approach to Self-Restricted Delegation of Rights in Grids. - Stefan Piger; Christian Grimm; Ralf Groeper; Christopher Kunz (CCGRID, 2008)

Connecting OGC web services and the Grid using Globus Toolkit 4 and OGSA-DAI. - Ralf Groeper; Christopher Kunz; Christian Grimm (GRID, 2009)

A concept for attribute-based authorization on D-Grid resources. - Ralf Groeper; Christian Grimm; Siegfried Makedanz; Hans Pfeiffenberger; Wolfgang Ziegler; Peter Gietz; Michael Schiffers (Future Gener. Comput. Syst., 2009)

Attributbasierte Autorisierung im Grid Computing: vertrauenswürdige Architekturen und sichere Implementierung. - Ralf Gröper (2011)

Konzept und Nutzen von Certificate Policy und Certification Practice Statement. - Jürgen Brauckmann; Ralf Gröper (Datenschutz und Datensicherheit, 2013)