Cite original literature

[stefan-balke]

Hey,

it happened to me that I want to know more about a particular feature–what a surprise.
However, we are often missing citation to the original literature.
For instance, mel filters (https://github.com/librosa/librosa/blob/master/librosa/filters.py#L259), what or who is "Stanley"? Stanley Smith Stevens?
However, adding a literature remark would clarify this and also could document if we deviate with our implementation from that.

What do you think, worth the effort?

[bmcfee]

what or who is "Stanley"? Stanley Smith Stevens?

This guy

But yes, there should be a reference to the auditory toolbox in the docs there.

[lostanlen]

I couldn't believe that this issue had been unresolved for five months so I wrote a piece of doc in mel_frequencies (PR #701) in an attempt to close it.

[lostanlen]

can we close this now that #701 is merged?