Hypergraphs and the Clar problem in hexagonal systems. - Khaled Salem; Hernán G. Abeledo (Discret. Optim., 2006)

On the role of hypercubes in the resonance graphs of benzenoid graphs. - Khaled Salem; Sandi Klavzar; Ivan Gutman (Discret. Math., 2006)

On plane bipartite graphs without fixed edges. - Khaled Salem; Sandi Klavzar (Appl. Math. Lett., 2007)

The Clar formulas of a benzenoid system and the resonance graph. - Khaled Salem; Sandi Klavzar; Aleksander Vesel; Petra Zigert (Discret. Appl. Math., 2009)

Maximum cardinality resonant sets and maximal alternating sets of hexagonal systems. - Sandi Klavzar; Khaled Salem; Andrej Taranenko (Comput. Math. Appl., 2010)

A characterization of 1-cycle resonant graphs among bipartite 2-connected plane graphs. - Sandi Klavzar; Khaled Salem (Discret. Appl. Math., 2012)

A reference frequency quadrupler for high performance frequency synthesizers. - Khaled Salem; Mostafa Essawy; Hesham Omran; Sameh A. Ibrahim (Microelectron. J., 2020)