@article{MET_1967__12_175342,
     author = {M.T. Subrahmanya},
     title = {On the {Positivity} of a {Variance-Estimator} .},
     journal = {Metrika},
     pages = {43--47},
     year = {1967},
     volume = {12},
     zbl = {0149.14808},
     url = {http://geodesic.mathdoc.fr/item/MET_1967__12_175342/}
}