Microsoft changed OneDrive, no longer allows short URLs. This, I think, for security reasons.

I've updated my list of links to sources of information on lenses to include the current URLs for all of the lens related PDFs I've put up on my OneDrive. The list itself is also on my OneDrive, so here's the new URL:

https://onedrive.live.com/redir?resi...nt=file%2cdocx