Authors
1 Institute for Mathematical Research, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
2 Department of Mathematics, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
3 School of Mathematical Sciences, Faculty of Science & Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
4 Department of Mathematics, Babeş-Bolyai University, R-400084 Cluj-Napoca, Romania
Abstract
Keywords