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M. Karimpour and  L. Hitihamillage and  N. Elkhoury and  S. Moridpour and  R. Hesami,  Nonlinear Estimation Model for Rail Track Deterioration.   journal   = {International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2017, vol. 129(9). 1591 - 1595[viewed 20 June 2018]. Available from: http://waset.org/publications/10007916.