WASET
    Gyoutae Park and  Geunjun Lyu and  Yeonjae Lee and  Wooksuk Kim and  Jaheon Gu and  Sanguk Ahn and  Hiesik Kim,  A Smart Monitoring System for Preventing Gas Risks in Indoor.   journal   = {International Journal of Information and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2015, vol. 102(6). 1420 - 1426
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10001537.