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by Roberts, Fred
by Bodendiek, Rainer; Henn, Rudolf
by Liu, Bolian; Lai, Hong-Jian
by Golumbic, Martin Charles; Hartman, Irith Ben-Arroyo
by Nešetril, Jaroslav; Pellegrini, Marco
by John M. Harris; Jeffry L. Hirst; Michael J. Mossinghoff
by Bolian Liu; Hong-Jian Lai
by Jaroslav Nešetril