Bastian Bosse Research

I've been thinking of doing more research on Bastian Bosse and was wondering if there are any good archives/general places where there would be some information?

I'm am not so much into the case of Bosse, but maybe i research more in the future. Here is a website that has pretty good information about him. 

There are archives of his journal, his virtual journal, his website and a transcript of a video of him.
https://schoolshooters.info/bastian-bosse

Hope this can help you a little.