Safety Monitoring of Transportation Infrastructure Foundation: Intelligent Recognition of Subgrade Distresses Based on B-Scan GPR Images. - Zijin Xu; Xin Yu; Zhuo Liu; Song Zhang; Qinxia Sun; Ning Chen; Haotian Lv; Dawei Wang 007; Yue Hou (IEEE Trans. Intell. Transp. Syst., 2023)