I know maybe this question is more appropriate to the community History of Science and Mathematics, and I have already posted it there. But, since it is considerably smaller than the Mathematics community, it has reached very few people (around 49 views within almost one and a half day). Due to this, I think I can ask that question here, where I can reach more people and, then, increase the chances of getting satisfactory answers... (I didn't get any answer there and therefore I'll deleted the question, leaving it only here)
So, let's go to the question:
We know Vikings were good, among other things, in building ships, so they must have had some knowledge in astronomy, geography, maybe, math, and so on.
Is there any "good" reference (rather a book on the academic literature, which explores it in a more detailed and exhaustive way, instead of only "sites on the web") on the Mathematics of the Vikings? I need as much references on this subject as I can get... (I know this task can be difficult, and that such a reference MIGHT NOT EXIST, since Vikings could have had not a written culture, leaving no recording of the math they had possibly developed).
Maybe a reference which is about Viking Science instead of Viking Math would help.