Stewart, Kathryn and Ge, Yingen (2012) Dynamic congestion charging-Investigating boundary effects when applying low revenue tolls. In: The Operations Research Society OR54 Conference, 4-6 September 2012, The University of Edinburgh. (Unpublished)

Ge, Yingen and Stewart, Kathryn (2012) Investigating spatial and temporal undesired boundary effects arising from congestion charging. In: DTA 2012; 4th International Symposium on Dynamic Traffic Assignment, 4-6 June 2012 , Marthas Vinyard, USA. (Unpublished)

Stewart, Kathryn and Ge, Yingen (2011) Dynamic congestion charging: optimising network flows with variable tolling periods. In: Transportdynamics. University of Hong Kong, Hong Kong. ISBN 978-988-98847-9-6

Ge, Yingen and Stewart, Kathryn (2010) Investigating boundary issues arising from congestion. In: New Developments in Transport Planning. Edward Elgar, Cheltenham, pp. 303-326. ISBN 978-1-84844-963-3

Stewart, Kathryn and Ge, Yingen (2010) Optimising network flows by low-revenue tolling under the principles of dynamic user equilibrium. In: 5th IMA International conference on Mathematics in Transport, 2010 April, UCL, London. (Unpublished)