Cite Lecture Notes on Astrophysics?

[virgil1612]

When I'm interested in a subject (Astrophysics) I'm looking quite often at Lecture Notes of various instructors that I can easily find on the Internet in pdf form. Can I cite those notes on this forum if necessary?
Thanks, Virgil.

 

[mfb]

I'm sure there are cases where this is problematic, but most of the time it should be fine.

 

[virgil1612]

OK then, thanks. Of course I would cite the source, and anyway I would talk about the good ones, not the not so good ones.