CLX                     Two-Sample Covariance Test by Cai, Liu and Xia
                        (2013)
LC                      Two-Sample Covariance Test by Li and Chen
                        (2012)
PEC                     Two-Sample Covariance Test by Yu, Li and Xue
                        (2022)
PECO                    Two-Sample Covariance Test by Yu, Li, Xue and
                        Li(2022)
PEF                     Two-Sample Covariance Test by Yu, Li and Xue
                        (2022)
cm13                    One-Sample Covariance Test by Cai and Ma (2013)
cmtwo                   Two-Sample Covariance Test by Cai and Ma (2013)
syk                     One-Sample Covariance Test by Srivastava,
                        Yanagihara, and Kubokawa (2014)
