If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
I wouldn’t use special characters in a permalink. Nobody cares if ä or a is used in an url.
Can you point me to some resources about this topic? I can’t imagine that google prefers special characters in urls – I’ve only found one discussion which comes to the conclusion that it’s a good idea: http://www.google.com/support/forum/p/Webmasters/thread?tid=027557ee122ec2b1&hl=en
If the keyword is in the url you will be higher up in google when searching on that keyword.
I don’t have any resources to point you to at the moment.
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