I wuz thinkin of the following one, in which there are maps. Mike's URL is an essential primer.
http://hyperion.math.upatras.gr/commorg/ekeblad/multdyn.html
> For those who have not read Eva's earlier work on xlchc and xmca, which has
> never been properly appreciated
> in my opinion, see the following url, which may not be obvious on google.
> Thanks bill for trying to re-mind us.
>
> mike
>
> ttp://hyperion.math.upatras.gr/commorg/ekeblad/cocomu.html
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> xmca@weber.ucsd.edu
> http://dss.ucsd.edu/mailman/listinfo/xmca
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