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Dedicated to the 90th anniversary of my teacher, Petr Lavrent’evich Ul’yanov
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Rubinshtein, A.I. On a Set of Weakly Multiplicative Systems. Math Notes 105, 473–477 (2019). https://doi.org/10.1134/S0001434619030192
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DOI: https://doi.org/10.1134/S0001434619030192