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Author: Topp, Jerzy

• Topp, Jerzy; Volkmann, Lutz: Antineighbourhood graphs. (English). Mathematica Slovaca, vol. 42 (1992), issue 2, pp. 153-171
• Topp, Jerzy: Geodetic line, middle and total graphs. (English). Mathematica Slovaca, vol. 40 (1990), issue 1, pp. 3-9