On the almost-everywhere convergence of the Riesz means of double orthogonal series von Andrienko, V. A., Андриенко, В. А., Андриенко, В. А.

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On the order of growth of rectangular partial sums of double orthogonal series von Andrienko, V. A., Андриенко, В. А., Андриенко, В. А.

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