MathSciNet bibliographic data MR494472 60G45 Burkholder, D. L.; Shintani, T. Approximation of \$L\sp{1}\$$L\sp{1}$-bounded martingales by martingales of bounded variation. Proc. Amer. Math. Soc. 72 (1978), no. 1, 166–169. Article

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