Bull. Korean Math. Soc. 2013; 50(5): 1495-1499
Printed September 1, 2013
https://doi.org/10.4134/BKMS.2013.50.5.1495
Copyright © The Korean Mathematical Society.
M\'{a}rio Bessa
Universidade da Beira Interior
2022; 59(2): 481-506
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