Layered Queuing Networks for Simulating Enterprise Resource Planning Systems. - Stephan Gradl; André Bögelsack; Holger Wittges; Helmut Krcmar (MSVVEIS, 2009)

Modeling ERP Business Processes using Layered Queueing Networks. - Stephan Gradl; Manuel Mayer; Holger Wittges; Helmut Krcmar (ICEIS (3), 2010)

Measuring the Buffer Occupation of SAP ERP System Applications. - Stephan Gradl; Manuel Mayer; Alexandru Danciu; Ramón Escrihuela; Holger Wittges; Helmut Krcmar (ICEIS (3), 2011)

Performance-Modellierung und Simulation eines SAP-ERP-Systems. - Stephan Gradl (2012)