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第64行： − Anderson, W. P. (2012). ''Economic geography''. Routledge. − − Fotheringham, A.S. and M.E. O’Kelly. (1989) Spatial Interaction Models: Formulations and Applications. London: Kluwer Academic. − − Haynes, K.E., & Fotheringham, A.S. (1985). Gravity and Spatial Interaction Models. Reprint. Edited by Grant Ian Thrall. WVU Research Repository, 2020. − − Huff, D.L. and G.F. Jenks (1968) “A Graphic Interpretation of the Friction of Distance in Gravity Models”, Annals of the Association of American Geographers, Vol. 58, No. 4, pp. 814–824. − − Rodrigue, J. P. (2020). ''The geography of transport systems''. Routledge.
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