@article{Ding2015, author = "Yi Ding and Kai Hu and Kai Wu and Zhenlong Zhao", title = "{The monitoring principle diagram.}", year = "2015", month = "12", url = "https://plos.figshare.com/articles/figure/_The_monitoring_principle_diagram_/835906", doi = "10.1371/journal.pone.0077742.g002" }