JIAN, Q., J. Li, J. Wu, L. Zhang, and C. Zhang. “An Intelligent Device for Mask Disposal and Clean Mask Offering”. IJRDO - Journal of Mechanical And Civil Engineering, Vol. 8, no. 1, May 2022, pp. 1-5, http://545406.voltageenergyhk.tech/index.php/mce/article/view/5042.