@article{MET_1981__28_175795,
     author = {A. Chaudhuri and R. Arnab},
     title = {On {Non-Negative} {Variance-Estimation.}},
     journal = {Metrika},
     pages = {1--12},
     publisher = {mathdoc},
     volume = {28},
     year = {1981},
     zbl = {0458.62009},
     url = {http://geodesic.mathdoc.fr/item/MET_1981__28_175795/}
}