Zarita Zainuddin and  Mohammed Mahmod Shuaib and  Ibtesam M. Abu-Sulyman,  The Characteristics of the Factors that Govern the Preferred Force in the Social Force Model of Pedestrian Movement.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2010, vol. 38(2). 316 - 320
    [viewed 25 January 2020]. Available from: https://publications.waset.org/pdf/3029.