There are a number of graphs associated with T. I. (and C. T.) Zamfirescu. The Zamfirescu graphs on 36 and 75 vertices, the former of which is a snark, appear in Zamfirescu (1976). The Zamfirescu graph on 48 vertices appears in Zamfirescu and Zamfirescu (2007) and is a planar hypohamiltonian graph.
The Zamfirescu graphs are implemented in the Wolfram Language as GraphData["ZamfirescuGraph36"], GraphData["ZamfirescuGraph48"], and GraphData["ZamfirescuGraph75"], respectively.
The figures above show the adjacency, incidence, and graph distance matrices of the Zamfirescu 48-graph.