i have generally found this: http://www.cs.stir.ac.uk/~kjt/research/pdf/expl-m4.pdf http://www.cs.stir.ac.uk/~kjt/research/pdf/expl-m4.pdf to be pretty exhausti

i have generally found this: http://www.cs.stir.ac.uk/~kjt/research/pdf/expl-m4.pdf http://www.cs.stir.ac.uk/~kjt/research/pdf/expl-m4.pdf to be pretty exhaustive / thorough coverage of m4.