The main reference is the manual in the documentation of Comet distribution
Dynadec’s Forum
Hakan Kjellerstrand’s Comet page
Old homepage before Dynadec
Emacs style
Basic examples to learn the syntax [example1.co] [example2.co] [example3.co] [example4.co]
Read command line and DIMACS format
The queens graphs
Manual for Unix shell utilities useful for parsing and other file managing
Further links to graph libraries