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*Brassel, K.E. (1974), "A model for automatic hill shading," American Cartographer: vol. 1(1), pp 15-27.
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*Clarke, Keith C. (1995), Analytical Computer Cartography, 2nd Edition. Englewood Cliffs, NJ: Prentice Hall. Chapter 13: Terrain Analysis.
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*Imhof, Eduard, edited by H.J. Steward (1982), Cartographic Relief Presentation. Berlin: Walter de Gruyter.
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*Lewis, P. (1992), "Introducing a cartographic masterpiece: a review of the U.S. Geological Survey's digital terrain map of the United States, by Gail Thelin and Richard Pike," Annals, Association of American Geographers: vol. 82(2), pp 289-300.
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*Pike, R.J., Thelin, G.P. (1992), "Visualizing the United States in computer chiaroscuro," Annals, Association of American Geographers: vol. 82(2), pp 300-302.
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*Woo, A., Poulin, P., Fournier, A. (1990), "A survey of shadow algorithms," IEEE Computer Graphics and Applications: vol 10(6), pp 13-32.
*Yoeli, P. (1959), "Relief shading," Surveying and Mapping: vol. 19(2), pp 229-232.
*Yoeli, P. (1965) "Analytical hill shading," Surveying and Mapping: vol. 25(4); pp 573-579.
*Yoeli, P. (1966), "Analytical hill shading and density," Surveying and Mapping: vol 26(2), pp 253-259.
*Yoeli, P. (1967), "The mechanisation of analytical hill shading," Cartographic Journal: vol 4(2), pp 253-259.
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Yoeli, P. (1977) "Computer-executed interpolation of contours into arrays of randomly distributed height-points," Cartographic Journal: vol. 14(2), pp 103-108.
Zhou Qiming (1992) "Relief shading using digital elevation models," Computers and Geosciences: vol. 18(8), pp 1035-1045.
*sources used to compile notes
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