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The research of the first-named author was supported in part by the Center for Advanced Study of the University of Illinois and by the National Science Foundation under grant GP-8727.
The research of the second-named author was supported in part by the Research Council of Rutgers University while the author was in residence at the University of Illinois (summer 1968) and the Hebrew University of Jerusalem (academic year 1968–69) and by the National Science Foundation under grant GP-8056.
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Burkholder, D.L., Gundy, R.F. Extrapolation and interpolation of quasi-linear operators on martingales. Acta Math. 124, 249–304 (1970). https://doi.org/10.1007/BF02394573
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DOI: https://doi.org/10.1007/BF02394573