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Martini, H., Spirova, M. & Swanepoel, K.J. Geometry Where Direction Matters—Or Does It?. Math Intelligencer 33, 115–125 (2011). https://doi.org/10.1007/s00283-011-9233-4
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DOI: https://doi.org/10.1007/s00283-011-9233-4