ISSN | 0239-7269 |
Bulletin of the Polish Academy of Sciences. Mathematics
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Bulletin of the Polish Academy of Sciences. Mathematics > 2015 > 63 > 3 > 249-260
Bulletin of the Polish Academy of Sciences. Mathematics > 2015 > 63 > 3 > 195-206
Bulletin of the Polish Academy of Sciences. Mathematics > 2015 > 63 > 3 > 207-216