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ISSN:0195-6698|18|3|303-309

Academic Press‎(1997)‎

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By Kéri G.   Östergård P. R. J.   in Studia Scientiarum Mathematicarum Hungarica

ISSN:0081-6906|40|1-2|242-256

Akademiai Kiado‎(2003)‎

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