Planar maps with prescribed types of vertices and faces
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[1] H. S. M. Coxeter,et al. Vorlesungen über die Theorie der Polyeder , 1935 .
[2] Note on a Problem by S. L. Hakimi Concerning Planar Graphs Without Parallel Elements , 1964 .
[3] V. Eberhard. Zur Morphologie der Polyeder , 1891 .