Authors
Ioan-Lucian Popa
Department of Exact Science and Engineering, “1 Decembrie 1918” University of Alba Iulia, Alba Iulia, Romania
Traian Ceauşu
Department of Mathematics, West University of Timişoara, Timişoara, Romania
Ovidiu Bagdasar
School of Computing and Mathematics, University of Derby, Derby
Ravi P. Agarwal
Department of Mathematics, Texas A&M University-Kingsville, Kingsville