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Additional information
Moscow Institute for Upgrading Qualifications of Supervisors and Specialists in the Chemical Industry, Moscow. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 21, No. 2, pp. 128–138, March–April, 1980.
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Labsker, L.G. Some necessary and sufficient criteria for Korovkin sets for operators of class S. Sib Math J 21, 242–249 (1980). https://doi.org/10.1007/BF00968271
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DOI: https://doi.org/10.1007/BF00968271