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trees; geodetic graphs; binary operations

References:

[1] G. Chartrand L. Lesniak: **Graphs & Digraphs**. Third edition. Chapman & Hall, London, 1996. MR 1408678

[2] L. Nebeský: **An algebraic characterization of geodetic graphs**. Czechoslovak Math. J. 48 (1998), 701-710. DOI 10.1023/A:1022435605919 | MR 1658245