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Original Russian Text © E. A. Shiryaev, A. A. Shkalikov, 2007, published in Matematicheskie Zametki, 2007, Vol. 81, No. 4, pp. 636–640.
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Shiryaev, E.A., Shkalikov, A.A. Regular and completely regular differential operators. Math Notes 81, 566–570 (2007). https://doi.org/10.1134/S0001434607030352
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DOI: https://doi.org/10.1134/S0001434607030352