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This work was supported by the National Research Council of Canada, grant No. A7262 and by the Summer Research Institute of the Canadian Mathematical Congress at Laval University in 1970.
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Lawruk, B., Światak, H. On functions satisfying a generalized mean value equation. Aeq. Math. 11, 1–10 (1974). https://doi.org/10.1007/BF01837728
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DOI: https://doi.org/10.1007/BF01837728