Reaheam A-S. REGIONAL BOUNDARY ASYMPTOTIC GRADIENT FULL ORDER OBSERVER VIA INTERNAL REGION. QJPS [Internet]. 2020Mar.3 [cited 2026Jan.18];25(1):math 40- 45. Available from: https://www.journalsc.qu.edu.iq.51-77-64-103.cpanel.site/index.php/JOPS/article/view/1061