Login New user?   04-Information Sciences Letters An International Journal   ISL Home   Aim and Scope   For Reviewers   For Authors   Editorial Board   Publication Ethics   Processing Charges   Indexing   Submit an Article   Content   Forthcoming Papers   Subscription Author     Name : S. Suwilo Address : Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan, 20155, Indonesia Email : saib@usu.ac.id Telephone :   Home   About us   News   Journals   Conferences Contact us Copyright naturalspublishing.com. All Rights Reserved