MathSciNet bibliographic data MR1979927 (2004d:42026) 42B25 Alfonseca, Angeles; Soria, Fernando; Vargas, Ana An almost-orthogonality principle in \$L\sp 2\$$L\sp 2$ for directional maximal functions. Harmonic analysis at Mount Holyoke (South Hadley, MA, 2001), 1–7, Contemp. Math., 320, Amer. Math. Soc., Providence, RI, 2003. Article

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