Porter, W.F. and K.E. Church. 1987. Effects of environmental pattern on habitat preference analysis. Journal of Wildlife Management 51(3):681-685.

Abstract: Changes in study area boundaries can affect inferences of habitat use by wildlife. In environments with regular patterns of cover dispersion, tests show delineation of study area boundaries has no effect on statistical indication of habitat use. In environments in which cover types are arranged in n aggregated pattern, traditional statistical approaches may yield spurious results. We present an analytical approach using grid cells, which offers an alternative way to examine habitat use patterns by wildlife.