(defmethod graph->dot-external ((g basic-graph) file-name &key (type :ps))
"Generate an external represenation of a graph to a file, by running
the program in *dot-path*."
(defmethod graph->dot-external ((g basic-graph) file-name &key (type :ps))
"Generate an external represenation of a graph to a file, by running
the program in *dot-path*."