MathSciNet bibliographic data MR656117 (84g:60079) 60G42 (42B25) Cox, David C. The best constant in Burkholder's weak-\$L\sp{1}\$$L\sp{1}$ inequality for the martingale square function. Proc. Amer. Math. Soc. 85 (1982), no. 3, 427–433. Article

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