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Young Hoon Lee and  Bong Jin Kang and  Won Ho Kang,  An Empirical Formula for Seismic Test of Telecommunication Equipments.   journal   = {International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology. December 2012, vol. 72(12). 1542 - 1544[viewed 22 October 2018]. Available from: http://waset.org/publications/9339.