Extremal versions of the Pompeiu problem. (English. Russian original) Zbl 1006.26008
Ukr. Math. J. 53, No. 11, 1801-1808 (2001); translation from Ukr. Mat. Zh. 53, No. 11, 1482-1487 (2001).
Reviewer: A.M.Gomilko (Kyïv)