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. 21, no. 4 (Dec. 2008), pp.124-130, 7 p.
Subjects: Abstract algebra; Universal algebra