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Author: Niepel, Ľudovít

• Knor, Martin; Niepel, Ľudovít; Šoltés, Ľubomír: Centers in line graphs. (English). Mathematica Slovaca, vol. 43 (1993), issue 1, pp. 11-20
• Niepel, Ľudovít: On decompositions of complete graphs into factors with given diameters and radii. (English). Mathematica Slovaca, vol. 30 (1980), issue 1, pp. 3-11