@article {Covariance1982,
title = {Covariance Analysis and Seemingly Unrelated Regressions},
year = {1982},
notes = {https://doi.org/10.2307/2683170},
url = {https://www.esri.ie/publications/covariance-analysis-and-seemingly-unrelated-regressions},
author = {Conniffe, Denis},
journal = {The American Statistician, Vol. 36, No. 3, Part 1, pp. 169-171},
}