1. 1.  J. Sales, J. V. Marti, R. Marin, E. Cervera, and P. J. Sanz, CompaRob:“The shopping cart assistance robot, Int. J. Distributed Sensors Networks”, vol. 2016, Article ID 4781280, 15 pages, 2016
   2.  P. Chandrasekar and T. Sangeetha, “Smart shopping cart with automatic billing system through RFID and Zigbee”, Int. Conf. Information Communication and Embedded Systems (ICICES), pp. 1-4, India, Feb. 2014.
   3.  R. Kumar, K. Gopalakrishna, and K. Ramesha, “Intelligent shopping cart,” Int. J. Engineering Science and Innovative Technology, vol. 2, no.4, pp. 499-507, 2013.
   4.  Hsin-Han Chiang, Wan-Ting You, Shu-Hsuan Lin, Wei-Chih Shih, Yu-Te Liao, Jin-Shyan Lee, and Yen-Lin Chen, “Development of Smart Shopping Carts with Customer-Oriented Service,” 2016 International Conference on System Science and Engineering (ICSSE) National Chi Nan University, Taiwan, July 7-9, 2016.
   5.  Prof. A. D. Kadage, G. V. Mali, M. D. Shaikh, S. D. Shintre, “Inventory Control and Theft Detection in Mall Using RFID,” 2016, International Journal of Emerging Research in Management &Technology ISSN: 2278-9359 (Volume-5, Issue-5).
   6. “Futuristic Trolley for Intelligent Billing with Amalgamation of Radio Frequency Identification and ZIGBEE”. International Journal of Computer Applications (0975 – 8887) International Conference on Recent Trends in engineering & Technology - 2013(ICRTET'2013).
   7. Komal MachhirkeJ, Rupali Rathod, Rinku Petkar, and Manohar Golait: “A New Technology of Smart Shopping Cart using RFID and ZIGBEE”, (Volume5, Issue-2) 2017.