Xtent Modelling - weighted thiessen polygons

Hi, I have a series of archaeological sites which I want to analyse using an XTENT model. This is essentially just a more complex voronoi that takes into account the 'size' of each site.  Essentially, weighted Thiessen polygons. I have the area data of each site, and the raster.  This is the formula: I = C^a - k*d
How do I do this in GM? 
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