Hi, i'm looking for recent formulas about the gravitational models in the spatial interaction field or spatial statistics. The precursor of these type of models was Reilly in the 1931,with his work "the law of gravitation retail" and then several professors created other formulas which improved the original. But i found nothing after the 1980's...do you know something about more recent studies about it? I need this information for elaborating my thesis..i'm an italian student. Hope you 'll help me..thanks... . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
