A. Hung and  K. Mithraratne and  M. Sagar and  P. Hunter,  Multilayer Soft Tissue Continuum Model: Towards Realistic Simulation of Facial Expressions.   journal   = {International Journal of Biomedical and Biological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2009, vol. 30(6). 62 - 66
    [viewed 23 April 2021]. Available from: https://publications.waset.org/pdf/9692.