@article{ZNSL_1974_43_a4,
     author = {L. B. Klebanov},
     title = {Unbiased estimators and convex loss functions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {40--52},
     publisher = {mathdoc},
     volume = {43},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_43_a4/}
}