On the preservation of direction-convexity and the Goodman-Saff conjecture
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Ruscheweyh, S., & Salinas, C. L. (1989). On the preservation of direction-convexity and the Goodman-Saff conjecture. Annales Fennici Mathematici, 14(1), 63–73. https://doi.org/10.5186/aasfm.1989.1427
Copyright (c) 1989 The Finnish Mathematical Society
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