Authors
Emilia-Loredana Pop
Babeş-Bolyai University, Faculty of Mathematics and Computer Science, Department of Mathematics, Cluj-Napoca
Dorel Duca
Babeş-Bolyai University, Faculty of Mathematics and Computer Science, Department of Mathematics, Cluj-Napoca
Augusta Raţiu
Lucian Blaga University of Sibiu, Faculty of Science Department of Mathematics and Computer Science, Sibiu, Romania