Authors
Camelia Liliana Moldovan
Faculty of Mathematics and Informatics, Transilvania University of Brasov, Brasov, Romania
Radu Paltanea
Faculty of Mathematics and Informatics, Transilvania University of Brasov, Brasov, Romania
Ion Visa
Renewable Energy Systems and Recycling (RESREC) Research Centre, R&D Institute, Transilvania University of Brasov, Brasov, Romania
