Cycle Plot

M. Bögl, “Visual Analysis of Periodic Time Series Data - Supporting Model Selection, Prediction, Imputation, and Outlier Detection Using Visual Analytics”, TU Wien, 2020.
M. Bögl et al., “Cycle Plot Revisited: Multivariate Outlier Detection Using a Distance-Based Abstraction”, Computer Graphics Forum, vol. 36, no. 3, pp. 227–238, 2017.