Pitney Bowes MapInfo Vertical Mapper - Manual (Page 70)

Understanding the Trade Area Analysis Model
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Vertical Mapper 3.7
For further readings on the topic of spatial interaction, refer to:
Fotheringham, S. and O'Kelly, M., 1989: Spatial Interaction Models: Formulations and
Applications. Kluwer Academic Publishers.
Taylor, P. J., 1975: Distance Decay Models in Spatial Interactions. Concepts and Techniques in
Modern geography. Norwich: Geo Books.