Journal ArticleNonparametric monitoring of multivariate data via KNN learningLi, Wendong; Zhang, Chi; Tsung, Fugee; Mei, Yajunnull2021-10-1810300482International Journal of Production Research59206311 to 63260020-7543https://doi.org/10.1080/00207543.2020.18127501830344; 2015405National Science Foundation