7Brotcorne L, Laporte G,Semet F.Ambulance location and relocation models[J]. European Journal of Operational Research, 2003,147(3): 451-463.
8Daskin M S. A maximum expected location model: Formulation, properties and heuristic solution[J]. Transportation Science,1983,17 (7):48-70.
9ReVelle C S,Hogan K.The maximum availability location problem[J]. Transportation Science, 1989, 23(3): 192-200.
10Rajagopalan H K, Saydam C, Xiao J. A multiperiod set coveting location model for dynamic redeployment of ambulances [J]. Computers & Operations Research, 2008, 35(3): 814-826.