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Author: Oellermann, Ortrud R.

• Chartrand, Gary; Oellermann, Ortrud R.; Tian, Song Lin; Zou, Hung Bin: Steiner distance in graphs. (English). Časopis pro pěstování matematiky, vol. 114 (1989), issue 4, pp. 399-410
• Chartrand, Gary; Oellermann, Ortrud R.; Ruiz, Sergio: Randomly $H$ graphs. (English). Mathematica Slovaca, vol. 36 (1986), issue 2, pp. 129-136