I am writing my Master thesis right now. Two arguments in the proofs are based on REU papers written by students. As those are not officially published but made available on the universities' websites I am not sure if I am allowed to cite them.
Right now I use the webpage-tag with a "Last Visited" in BibTex. Is this a proper way to cite the work of somebody else even if it has not been published other than like this and this?
I was not sure whether this is not better asked at AcademiaSE. Please notify me and I will delete the question here.