@article{MET_1963__7_175217,
     author = {J.C. Koop},
     title = {On the {Axioms} of {Samples} {Formation} and {Their} {Bearing} on the {Construction} of {Linear} {Estimators} in {Sampling} {Theory} for {Finite} {Universe.}},
     journal = {Metrika},
     pages = {165--204},
     publisher = {mathdoc},
     volume = {7},
     year = {1963},
     zbl = {0117.36802},
     url = {http://geodesic.mathdoc.fr/item/MET_1963__7_175217/}
}