Steven Whittle and  Ingrida Valiusaityte,  Property Aggregation and Uncertainty with Links to the Management and Determination of Critical Design Features.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2008, vol. 18(6). 764 - 769
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/3552.