On planar geodetic graphs
Tài liệu tham khảo
Berge, 1958, Théorie des Graphes et ses Applications
Ore, 1962
Stemple, 1966, A Further Characterization of Geodetic Graphs
Watkins, 1964, A characterization of the Planar Geodetic Graph and Some Geodetic Properties of Non-planar Graphs
Watkins, 1967, A Characterization of planar Geodetic Graphs, J. Combinatorial Theory, 2, 102, 10.1016/S0021-9800(67)80118-2
