R.K.Uma Maheswari, ,S.Arunodhaya, V.Marimuthu, and D.Ramya. 2018. “A Survey of Railway Condition Monitoring by ZIGBEE Wireless Sensor Nodes”. International Journal of Intellectual Advancements and Research in Engineering Computations 6 (1):168-73. https://ijiarec.com/ijiarec/article/view/430.