DOI: http://dx.doi.org/10.14510%2Flm-ns.v38i2.1382.g1372
Sergiu Aizicovici
Department of Mathematics, Ohio University, Athens, OH 45701, USA
United States
Nikolaos S. Papageorgiou
Department of Mathematics, National Technical University, Zografou Campus, Athens 15780, Greece
Vasile Staicu
http://sweet.ua.pt/vasile
Department of Mathematics
University of Aveiro
3810-193 Aveiro
Portugal
Portugal
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