1. L. Bach, The problem of aggregation and distance for analyses of accessibility and access opportunity in location-allocation models, Environ. Planning A13(1981)955–978.
2. M.L. Brandeau and S.S. Chiu, An overview of representative problems in location research, Manag. Sci. 35(1989)645–673.
3. P.J.B. Brown and I. Masser, An empirical investigation of the use of Broadbent's rule in spatial system design, in:Spatial Representation and Spatial Interaction, ed. I. Masser and P.J.B. Brown (Martinus Nijhoff, Boston, MA, 1978).
4. P.A. Casillas, Data aggregation and thep-median problem in continuous space, in:Spatial Analysis and Location-Allocation Models, ed. A. Ghosh and G. Rushton (Van Nostrand Reinhold, New York, 1987), pp. 327–344.
5. J.R. Current and D.A. Schilling, Elimination of source A and B errors inp-median location problems, Geograph. Anal. 19(1987)95–110.