Y.C. Liu and  S.J. Lu and  Y.C. Weng and  H. Su,  Designing Pictogram for Food Portion Size.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2010, vol. 48(12). 1446 - 1451
    [viewed 21 October 2019]. Available from: https://publications.waset.org/pdf/14473.