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Bostjan Bresar, Manoj Changat, Joseph Mathews, Iztok Peterin, Prasanth G. Narasimha-Shenoi, Aleksandra Tepeh Horvat. Steiner intervals, geodesic intervals, and betweenness. Discrete Mathematics, 309(20):6114-6125, 2009. [doi]
Abstract is missing.