WASET
    Pearl Goswell and  Jun Jo,  Real-Time 3D City Generation using Shape Grammars with LOD Variations.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2012, vol. 61(1). 42 - 48
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/8001.