I doubt about the following situation.
There is a kind of lecture notes, which contains really valuable examples on which I want make a reference from my paper (I cite some of them and reuse some of them).
But this work wasn't officially published, and it is not listed in the list of the works in the [CV of the author][1]. The only one place where this document appears is this link:

https://pdfs.semanticscholar.org/95a3/cb63b80c3416879d534f41eedcd174b40159.pdf

So what the proper way to deal with this situation? Give a link like on web-resource as MISC or UNPUBLISHED or do not make reference at all?

At the moment citation of this work looks like:

*M. Kanazawa, Context-free tree grammars, SemanticScholar, URL https://pdfs.semanticscholar.org/95a3/cb63b80c3416879d534f41eedcd174b40159.pdf, 2012.* 

which doesn't look very nice.

**HINT**: I'm **not** asking for a specific TeX or BibTex advice! 
Below just a convenient formal view of the reference which I'm going to put.

    @MISC {kanazawamakoto2012,
        author   = "Kanazawa, Makoto",
        title    = "Context-free tree grammars",
        HOWPUBLISHED= {SemanticScholar},
        month    = "feb",
        year     = "2012",
        URL = "https://pdfs.semanticscholar.org/95a3/cb63b80c3416879d534f41eedcd174b40159.pdf"
    }


  [1]: http://research.nii.ac.jp/~kanazawa/