Kang-Gyu Park and  Sun-Jong Park and  Hong Jae Yim and  Hyo-Gyung Kwak,  Investigation of Fire Damaged Concrete Using Nonlinear Resonance Vibration Method.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2014, vol. 95(11). 1135 - 1139
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/9999700.