1. A. N. Al-Hussaini, Some almost everywhere convergence theorems for positive definite operators, Ph. D. thesis, University of Illinois, Urbana, Ill., 1964.
2. A converse to the dominated convergence theorem;Blackwell, David;Illinois J. Math.,1963
3. Successive conditional expectations of an integrable function;Burkholder, D. L.;Ann. Math. Statist.,1962
4. Maximal inequalities as necessary conditions for almost everywhere convergence;Burkholder, D. L.;Z. Wahrscheinlichkeitstheorie und Verw. Gebiete,1964
5. Iterates of conditional expectation operators;Burkholder, D. L.;Proc. Amer. Math. Soc.,1961