isotropic plane isotropic plane Central place theory en:Central place theory English Central place theory Teoría do Lugar Central isotropic plane isotropic plane central place “central place theory” Central Place Theory isotropic plane English Central Place Theory "central place theory" central places “central place theory” en:Central place theory isotropic plane Central place theory (Wikipedia) Wikipedia page of the Central Place Theory English isotropic plane English http://en.wikipedia.org/wiki/Central_place_theory