[GRASS-user] 2 important broken wiki-links

[Nikos Alexandris]

I am looking for a centroid definition (how is it calculated exactly)
and found some links in the wiki:

http://mpa.itc.it/markus/grass63progman/Vector_Library.html#background
http://grass.itc.it/grass63/manuals/grass63vectorlib_2007_07_28_refman.pdf

Regards, Nikos

P.S. I am not satisfied with the "centroid: a point within a closed
boundary" description. I am searching the archive but there is nothing
but this:
1. http://www.nabble.com/Re%3A-centroids-td8604170.html#a8604170
2. http://www.nabble.com/centroid-definition-td13296211.html#a13296211
(first post, unanswered)
3.
http://www.nabble.com/-GRASS-user--Geographic-Mean-td5692468.html#a5692443 (which I don't understand exactly).