@article{MET_1962__5_175147,
     author = {J.C. Koop},
     title = {On {Upper} {Limits} to the {Difference} in {Bias} {Between} {Two} {Ratio} {Estimates.}},
     journal = {Metrika},
     pages = {145--149},
     year = {1962},
     volume = {5},
     zbl = {0111.15902},
     url = {http://geodesic.mathdoc.fr/item/MET_1962__5_175147/}
}