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Toàn, NC. Involutionn-aire et ses applications a l'étud des hyperquadriques dans les espaces euclidiens et non-euclidiens an dimensions. Acta Mathematica Academiae Scientiarum Hungaricae 13, 109–113 (1962). https://doi.org/10.1007/BF02033630
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DOI: https://doi.org/10.1007/BF02033630