@article{eftekhari_2016,  title={A Differential Quadrature Procedure with Direct Projection of the Heaviside Function for Numerical Solution of Moving Load Problem},  volume={13},  ISSN={1679-7825},  url={https://doi.org/10.1590/1679-78252251},  DOI={10.1590/1679-78252251},  number={9},  journal={Latin American Journal of Solids and Structures},  publisher={Individual owner},  author={Eftekhari, S.A.},  year={2016},  month={Sep},  pages={1763–1781} }