Authors
Luminiţa Barbu
Faculty of Mathematics and Informatics, Ovidius University of Constanta, Constanta, Romania
Andreea Burlacu
andreea.laura.burlacu@365.univ-ovidius.ro
Doctoral School of Mathematics, Ovidius University of Constanta, Constanta, Romania
Gheorghe Moroşanu
Faculty of Mathematics and Computer Science, Babeş-Bolyai University, and Academy of Romanian Scientists, Cluj-Napoca