Some basic properties of idempotent matrices
By: Hammudat, Ala A.; Bilal, Ali A.; Muhammad, Akram S.. al-Tarbiyah wa-al-Ilm : Majallat ilmiyah lil-Buhuth al-Ilmiyah al-Asasiyah. Vol. 22, no. 1 (Mar. 2009), pp.93-99, 7 p.
Subjects: Abstract algebra; Universal algebra