Abdoerrachman, H., Imaizumi, S., Niimi, S. and Kumada, M. 1996. Objective documented study on stipulated target-tone. Test of vocal controllability with the electromyography background mechanism. Medical Journal of Indonesia. 5, 3 (Jul. 1996), 158-64. DOI:https://doi.org/10.13181/mji.v5i3.865.