I am writing my thesis and using notes from different lectures on the topic as a source of sources. These notes cite other papers and present briefly the ideas, and I do use the lecture notes to find interesting papers on the topic, and in order to add some formal thinking to my research, but never actually quote a part of the lecture notes nor do I take any ideas directly from the notes but rather from the cited papers. I just use the general structure as a "guard" for my own structure and a source of good papers.
Is there a way to cite these? It seems to me that it wouldn't be quite honest to not cite these lecture notes as they helped me a lot.
Idea: should I mention these maybe in the acknowledgement part? Or at the very end of the thesis, between conclusion and bibliography?