1  A general correlation coefficient for directional data and related regression problems.
Biometrika. 1980 67(1):163-173;
doi:10.1093/biomet/67.1.163
http://biomet.oxfordjournals.org/cgi/content/abstract/67/1/163


2   Information gain and a general measure of correlation
Biometrika 1983 70(1):163-173; doi:10.1093/biomet/70.1.163
http://biomet.oxfordjournals.org/cgi/content/abstract/70/1/163

3  Vector correlation
Biometrika 1979 66(1):41-48; doi:10.1093/biomet/66.1.41
http://biomet.oxfordjournals.org/cgi/content/short/66/1/41

4  Asymptotic covariance structure of serial correlations in multivariate time series
Biometrika 1989 76(4):824-827; doi:10.1093/biomet/76.4.824
http://biomet.oxfordjournals.org/cgi/content/short/76/4/824