8Drezner T, Drezner Z. A threshold-satisfying competitive location model [ J ]. Journal of Regional Science, 2002, 42 (2) : 287-299.
9Berman O, Krass D. Locating multiple competitive facilities: Spatial interaction models with variable expenditures[J]. Annals of Operations Research, 2002, 111(2): 197-225.
10Benati S. An improved branch & bound method for the uncapacitated competitive location problem [J]. Annals of Operations Research, 2003, 122(1): 43-58.