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Since the update of the website yesterday be aware that the link of the rss feed of the blog has changed. The new url is https://wyssmann.com/blog/index.xml. You can also simply click on the rss icon on the upper right:
You can also subscribe to other section of the page using https://wyssmann.com/<SECTION>/index.xml e.g.
https://wyssmann.com/projects/index.xml