Susana G. Azevedo and  Helena Carvalho and  V. Cruz –Machado,  Agile Index: Automotive Supply Chain.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2011, vol. 55(7). 1433 - 1439
    [viewed 28 January 2020]. Available from: https://publications.waset.org/pdf/11847.