Leela Krishna Chand, Gudi Siva, and Soo Young Shin. “Posture Sensor: Cross Leg Detector at Knee Level”. EAI Endorsed Transactions on Pervasive Health and Technology, vol. 2, no. 7, Dec. 2015, p. e5, https://doi.org/10.4108/eai.28-9-2015.2261509.