DOI: http://dx.doi.org/10.14510%2Flm-ns.v40i1.1474.g1500
Aurelian Cernea
Faculty of Mathematics and Computer Science,
University of Bucharest,
Academiei 14, 010014 Bucharest, Romania
Academy of Romanian Scientists,11 Splaiul Independentei 54,
050094 Bucharest, Romania
Vasile Staicu
http://sweet.ua.pt/vasile
Department of Mathematics
University of Aveiro
3810-193 Aveiro
Portugal
Portugal
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