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Abstract

This research is financially supported by the Russian Foundation for Basic Research (Grant 93-01-01753), the International Science Foundation together with the Russian Foundation for Basic Research (Grant NQ5300), and the Soros International Education Program in Sciences (Grant a672-m).
Translated fromSibirskii Matematicheskii Zhurnal, Vol. 37, No. 3, pp. 526–533, May–June, 1996.

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