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Zhou, Qiming, and Xuejun Liu. "Error analysis on grid-based slope and aspect algorithms." Photogrammetric Engineering and Remote Sensing 70, no. 8 (2004): 6.
Zhou, Qiming, and Xuejun Liu. "Error assessment of grid-based flow routing algorithms used in hydrological models." International Journal of Geographical Information Science 16, no. 8 (2002): 819-842.