Borowiecki, M.; Szamkolowicz, L. Remarques sur la construction des graphes symétriques. (French) Zbl 0238.05108 Pr. Mat. 13, 249-253 (1970). MSC: 05C20 PDFBibTeX XMLCite \textit{M. Borowiecki} and \textit{L. Szamkolowicz}, Pr. Mat. 13, 249--253 (1970; Zbl 0238.05108)
Szamkolowicz, L. Remarks on the characterization of a straight line among graphs on non- compact surfaces. (Polish) Zbl 0132.20603 Pr. Mat. 7, 11-17 (1962). PDFBibTeX XMLCite \textit{L. Szamkolowicz}, Pr. Mat. 7, 11--17 (1962; Zbl 0132.20603)
Szamkolowicz, L. On a certain characterization of straight line among plane graphs. (Polish) Zbl 0101.16701 Pr. Mat. 4, 83-89 (1960). PDFBibTeX XMLCite \textit{L. Szamkolowicz}, Pr. Mat. 4, 83--89 (1960; Zbl 0101.16701)