@article{GDZPPN00245226X, title = {On Classes of Estimators of the Variance Function of a Linear Estimator.}, journal = {Metrika}, volume = {19}, year = {1972}, pages = {15-20}, zbl = {0226.62070}, url = {http://dml.mathdoc.fr/item/GDZPPN00245226X} }
Prabhu Ajgaonkar, S.G. On Classes of Estimators of the Variance Function of a Linear Estimator.. Metrika, Tome 19 (1972) pp. 15-20. http://gdmltest.u-ga.fr/item/GDZPPN00245226X/