A graph model and grammar for multi-scale modelling using XL. - Yongzhi Ong; Winfried Kurth (BIBM Workshops, 2012)

Multi-scale Rule-Based Graph Transformation Using the Programming Language XL. - Yongzhi Ong (ICGT, 2012)

Extension of the Rule-Based Programming Language XL by Concepts for Multi-Scaled Modelling and Level-of-Detail Visualization. - Yongzhi Ong (2015)