abdel karim, a. i. (1964). difference equations. the institute of national planning.
Lua i Stíl Chicago (17ú heag.)abdel karim, abbas i. Difference Equations. cairo: the institute of national planning, 1964.
Lua MLA (9ú heag.)abdel karim, abbas i. Difference Equations. the institute of national planning, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.