abdel karim, a. i. (1964). difference equations. the institute of national planning.
Cita Chicago (17th ed.)abdel karim, abbas i. Difference Equations. cairo: the institute of national planning, 1964.
Cita MLA (9th ed.)abdel karim, abbas i. Difference Equations. the institute of national planning, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.