@article{MET_1972__18_175491,
     author = {S.G. Prabhu Ajgaonkar},
     title = {On {Classes} of {Estimators} of the {Variance} {Function} of a {Linear}  {Estimator.}},
     journal = {Metrika},
     pages = {15--20},
     publisher = {mathdoc},
     volume = {18},
     year = {1972},
     zbl = {0226.62070},
     url = {http://geodesic.mathdoc.fr/item/MET_1972__18_175491/}
}