Afzal Nehal, S. et al. 2018. Design and Development of Mach Zehnder Interferometer based Optical Sensors to Detection of Arsenic compound in Drinking Water. International Journal of Engineering & Technology. 7, 4.38 (Dec. 2018), 880–884. DOI:https://doi.org/10.14419/ijet.v7i4.38.27599.