At the request of the hang makers from PANArt the hangblog publishes two new Hang papers written for the International Symposium on Musical Acoustics, ISMA 2007, 9-12th September in Barcelona, where the Hang was presented 
by Felix Rohner, Sabina Schärer and Thomas D. Rossing.
History, Development and Tuning of the HANG
By Felix Rohner and Sabina Schärer
Abstract: The HANG is a new musical instrument, suitable for playing with the hands, consisting of two hemispherical shells of nitrided steel. It is the product of a collaboration among scientists, engineers and hangmakers, thanks to which we have been able to better understand the tuning process in all its complexity. Seven notes are harmonically tuned around a central deep tone (ding), which excites the Helmholtz (cavity) resonance of the body of the instrument. There are many ways to play the HANG. We show the different stages of its development over the seven years since its birth in 2000. We describe the tuning process and the musical conception of the HANG.
Read the paper in the Hang Library:
History, Development and Tuning of the HANG
Acoustics of the HANG: A hand-played steel instrument
By Thomas D. Rossing, Andrew Morrison, Uwe Hansen, Felix Rohner and Sabina Schärer
Abstract: The HANG is a new hand-played steel instrument developed by PANArt in Switzerland. We describe the modes of vibration, observed by holographic interferometry and the sound radiation from the instrument, observed by measuring the sound intensity in an anechoic room. A low-voice HANG is compared with a high voice-HANG.
Read the paper in the Hang Library:
Acoustics of the HANG: A hand-played steel instrument