Bull. Korean Math. Soc. 2015; 52(2): 679-684
Printed March 31, 2015
https://doi.org/10.4134/BKMS.2015.52.2.679
Copyright © The Korean Mathematical Society.
Andrzej Ganczar
Maria Curie-Sk{\l}odowska University
2017; 54(6): 2081-2089
2016; 53(6): 1887-1892
2015; 52(1): 105-123
2013; 50(4): 1329-1343
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