Institution: | 1. Department of Mathematics, University of Split, R. Bo?kovi?a 33, 21000 Split, Croatia;2. School of Mathematics and Statistics, Lanzhou University, Lanzhou, Gansu 730000, PR China;3. Faculty of Civil Engineering, Architecture and Geodesy, University of Split, Matice hrvatske 15, 21000 Split, Croatia;4. Department of Mathematics, Faculty of Civil Engineering, University of Zagreb, Ka?i?eva 26, 10000 Zagreb, Croatia |