Hadamard 2-groups with arbitrarily large derived length. - Jung R. Cho; Noboru Ito; Pan Soo Kim; Hyo-Seob Sim (Australas. J Comb., 1997)

The Graphical Regular Representations of Finite Metacyclicp-Groups. - Cai Heng Li; Hyo-Seob Sim (Eur. J. Comb., 2000)

On Half-Transitive Metacirculant Graphs of Prime-Power Order. - Cai Heng Li; Hyo-Seob Sim (J. Comb. Theory B, 2001)

Arc-transitive circulant digraphs of odd prime-power order. - Ming Yao Xu; Young-Gheel Baik; Hyo-Seob Sim (Discret. Math., 2004)