KUZMA, Bojan, 2006, Uskova, N.B.: On a result of R. Turner. (English. Russian original). - [J] Math. Notes 76, No. 6, 844-854 (2004); translation from Mat. Zametki 76, No. 6, 844-854 (2004). [ISSN 0001-4346; ISSN 1573-8876]. [na spletu]. 2006. [Dostopano 10 april 2025]. Pridobljeno s: http://www.zentralblatt-math.org/zmath/en/advanced/?q=an:1081.47014