Some Properties of Spectral Binary Relations. - Karim Belaid; Bahri Cherif; Othman Echi (RelMiCS, 1997)

T(α, β)-spaces and the Wallman compactification. - Karim Belaid; Othman Echi; Sami Lazaar (Int. J. Math. Math. Sci., 2004)

Two classes of locally compact sober spaces. - Karim Belaid; Othman Echi; Riyadh Gargouri (Int. J. Math. Math. Sci., 2005)