@article{MET_1981__28_175816,
     author = {N.D. Shukla and V.K. Srivastava and S. Bhatnagar},
     title = {Unbiased {Product} {Estimators.}},
     journal = {Metrika},
     pages = {191--196},
     publisher = {mathdoc},
     volume = {28},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/MET_1981__28_175816/}
}