[1] Univ Sheffield, Theoret Phys, Sheffield, S Yorkshire, England
[2] Concordia Univ, John Molson Sch Business, Operat Management, Montreal, PQ, Canada
[3] Univ Calgary, Calgary, AB, Canada
[4] Univ Lethbridge, Operat Res & Finance, Lethbridge, AB, Canada
[5] Greyhound Lines Canada, Transportat & Distribut Ind, Oliver, BC, Canada