For the last X years (X being a confidential and never to be revealed number, but large enough that AI was more than just deep learning at the time), Sergei Vassilvitskii and I have been toiling away at a book on clustering.
The book isn't ready yet, but we do have a draft of part I (the core of the book). Check it out, and send any comments you might have to clusteringbook@gmail.com.
