@article{MET_1972__19_175544,
     author = {J.C. Koop},
     title = {On the {Derivation} of {Expected} {Value} and {Variance} of {Ratios} without the {Use} of  {Infinite} {Series} {Expansions.}},
     journal = {Metrika},
     pages = {156--170},
     publisher = {mathdoc},
     volume = {19},
     year = {1972},
     zbl = {0252.62009},
     url = {http://geodesic.mathdoc.fr/item/MET_1972__19_175544/}
}