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Work supported from the Air Force Office of Scientific Research, Contract No. F 44620-67-C-0029.
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Ferus, D. On the type number of hypersurfaces in spaces of constant curvature. Math. Ann. 187, 310–316 (1970). https://doi.org/10.1007/BF01396461
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DOI: https://doi.org/10.1007/BF01396461