A. Shibata, R. Takahashi, Y. Nagahata, K. Kimura, R. Shimizu, M. Hotta, M. Inoue, and M. Higashimori: Food Texture Estimation by Using a Robotic Mastication Simulator Equipped with Teeth and a Tongue, Sensors and Materials, vol. 31, no. 7, pp. 2367-2380, 2019.