1. Department of Pharmaceutical Sciences, “Vasile Goldiş” Western University of Arad, L. Rebreanu Street, No. 86, 310048 Arad, Romania
2. Department of Hospitality Services, Babeş-Bolyai University, Horea Street, No. 7, 400174 Cluj-Napoca, Romania
3. Department of Mathematics, Government College University, Katchery Road, Lahore 54000, Pakistan
4. Department of Mathematics, Babeş-Bolyai University, M. Kogălniceanu Street, No. 1, 400084 Cluj-Napoca, Romania