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On plane bipartite graphs without fixed edgesKhaled Salem; Sandi Klavžar · Applied Mathematics Letters · 2007
The Clar formulas of a benzenoid system and the resonance graphKhaled Salem; Sandi Klavžar; Aleksander Vesel; Petra Žigert · 2009
Maximum cardinality resonant sets and maximal alternating sets of hexagonal systemsSandi Klavžar; Khaled Salem; Andrej Taranenko · 2010
On the role of hypercubes in the resonance graphs of benzenoid graphsKhaled Salem; Sandi Klavžar; Ivan Gutman · 2006