MathSciNet bibliographic data MR577744 13D03 (13H10) Ragusa, Alfio On openness of \$H\sb{n}\$$H\sb{n}$-locus and semicontinuity of \$n\$$n$th deviation. Proc. Amer. Math. Soc. 80 (1980), no. 2, 201–209. Article

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