Abstract. The above-titled paper of mine appeared in the Acta Sci. Math. (Szeged), 71 (2005), 159--174. Regrettably, the proof of our main result contains an error which we want to correct here.
AMS Subject Classification
(1991): 40C10, 42B10
Received August 15, 2006. (Registered under 5949/2009.)
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