This list of links is a loose, incomplete, and colourful collection of sources that have helped us in one way or another. May this growing list be of help to anyone who is interested in one of the listed topics.
From time to time (but admittedly, not often enough), we update this list since some links might not work anymore or we no longer think that they are as useful as we once thought they were. Also, we decided to include free information only - that is, if you would have to create an account or, worse, pay money to get the information, we won't include it in the list.
Before we get started, a short note: On this particular site, we don't link to primary research papers anymore since this would soon be way beyond the intended scope given the high number of potentially interesting papers out there. However, we urge everyone (including beginners) to look into the primary literature instead of relying on what others have already summarized (and pre-filtered!) only. Good places to go to are for example academia.edu, researchgate.net (account may be required), viking and fornvännen. Also, it's always a good idea to seek out the closest university's library and perhaps even get a library card.