My long-time work on piano multiphonics has recently been approved as my master’s thesis at the Sibelius Academy on May 17th.
The study is now publicly accessible to all composer and pianist colleagues for whom it might be helpful.
The text described and available in PDF format (the PDF file can be found near end of page)
The files from the audio CD

I am willing to keep this resource relevant and updated, so any missing information and new perspectives are welcome.