@article{MET_1987__34_176092,
     author = {W. Goldmann},
     title = {Risk-Efficient {Nonparametric} {Sequential} {Estimators.}},
     journal = {Metrika},
     pages = {25--30},
     publisher = {mathdoc},
     volume = {34},
     year = {1987},
     zbl = {0609.62121},
     url = {http://geodesic.mathdoc.fr/item/MET_1987__34_176092/}
}