In the period 2007-2011 I have completed a PhD dissertation on the Meaning and Use of Ideophones in Siwu. You can download the full thesis, and inspect supplementary materials, over at http://thesis.ideophone.org. Thank you for your interest!
- Dingemanse, Mark. ‘The Meaning and Use of Ideophones in Siwu’. PhD dissertation, Radboud University, 2011.