Tkachman, O., G. Purnomo, and B. Gick. “Cyclic Movement Primitives Underlying Two-Handed Alternating Signs In Signed Languages”. Canadian Acoustics, vol. 46, no. 4, Feb. 2019, pp. 24-27, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3242.