Sneha, A. ., V. . Sai Lakshmi Teja, T. . Kanti Mishra, and K. . N. Satya Chitra. “QR Code Based Indoor Navigation System for Attender Robot”. EAI Endorsed Transactions on Internet of Things, vol. 6, no. 21, Apr. 2020, p. e3, doi:10.4108/eai.13-7-2018.165519.