MathSciNet bibliographic data MR2340304 (2009a:42012) 42B10 (42B35 47B38 47G10) Kim, Joonil Sharp \$L\sp 2\$$L\sp 2$ bound of maximal Hilbert transforms over arbitrary sets of directions. J. Math. Anal. Appl. 335 (2007), no. 1, 56–63. Article

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