WASET
    Said M. Easa and  Shinya Kikuchi,  Generalized Method for Estimating Best-Fit Vertical Alignments for Profile Data.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2009, vol. 33(9). 308 - 316
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/4572.