It's the last week of term, and alas, also the last week of my work in Austria, at least for a while. I am planning to take a sabbatical from teaching here and moving to England where I have found an interesting job and better opportunities for research.
This means I will also take my servers with me, so for a short time in July, a 'light' version of the website will be running as http://www.ngberger.com on a small server in Graz only. When the main servers are operational in England, and domain name changes have been made, everything is likely to be back to normal. Sorry for the inconvenience this causes.
I'll miss you all. Keep in touch.