@article {A1966,
title = {A Note on Residual Heterovariance and Estimation Efficiency in Regression},
year = {1966},
notes = {http://doi.org/10.2307/2685962},
url = {https://www.esri.ie/publications/a-note-on-residual-heterovariance-and-estimation-efficiency-in-regression},
author = {Geary, Roy C},
journal = {The American Statistician, Vol. 20 No. 4, October 1966, pp. 30-31},
}