1. Chiou S.W. Derivatives in an area traffic control problem subject to user equilibrium traffic assignment.Universities Transport Stud. Group 29th Annual Conf.(1997a) Bournemouth University Poole, UK January 1997 . Unpublished
2. Chiou S.W. Optimisation of area traffic control subject to user equilibrium traffic assignment.25th Eur. Transport Forum, Proc. Seminar F, Transportation Planning Methods(1997b) II PTRC London 53 64