MathSciNet bibliographic data MR2292385 (2007k:42025) 42B20 (35J15 35J30 35J45 42B25 47B44 47D06 47F05) Auscher, Pascal On necessary and sufficient conditions for \$L\sp p\$$L\sp p$-estimates of Riesz transforms associated to elliptic operators on \$\Bbb R\sp n\$$\Bbb R\sp n$ and related estimates. Mem. Amer. Math. Soc. 186 (2007), no. 871, xviii+75 pp. Article

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