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During the last couple of months I've been experimenting with the number of links on each page of the sitemap.
Monitoring the visits of Google and the presence or non presence of cached versions of the article pages I found: that the google spider pretty consistently only caches and follows the first 1.026 links and ignores any further links.
I then rebuild the sitemap to include a maximum of 1000 links per page - now all pages gets indexed.
Just wanted to share, though this may be commom knowlegde.