M. A. Muratov and V. I. Chilin, “Almost-Everywhere Convergence and (<em class="a-plus-plus">o</em&gt;)-Convergence in Rings of Measurable Operators Associated with a Finite von Neumann Algebra”, Ukr. Mat. Zhurn., vol. 55, no. 9, pp. 1196-1205, Sep. 2003.