WASET
    Kyung Jin Ryu and  MakhsudaJuraeva and  Sang-Hyun Jeongand Dong Joo Song,  Ventilation Efficiency in the Subway Environment for the Indoor Air Quality.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2012, vol. 63(3). 549 - 553
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/3116.