Beberapa konsep keortogonan dan pencirian ruang hasil dharab terkedalam - Daud bin Mohamad (Bangi : Universiti Kebangsaan Malaysia, 1994)
Also available in print form
Tesis (Sarjana Sains) - Universiti Kebangsaan Malaysia, 1993
Bibliography : p. 63-64
Keywords: Inner product spaces