@article{MET_1974__21_175641,
     author = {J. PFANZAGL},
     title = {A {Characterization} of {Sufficiency} by {Power} {Functions.}},
     journal = {Metrika},
     pages = {197--200},
     publisher = {mathdoc},
     volume = {21},
     year = {1974},
     zbl = {0289.62009},
     url = {http://geodesic.mathdoc.fr/item/MET_1974__21_175641/}
}