Gu, J. , Chung, W. , Koo, M. , Lee, S. , Park, G. , Ahn, S. , Kim, H. , Park, J.. "Development and Evaluation of a Portable Ammonia Gas Detector". World Academy of Science, Engineering and Technology, Open Science Index 112, International Journal of Electronics and Communication Engineering, (2016), 10(4), 475 - 478.