@article{MET_1967__12_175338,
     author = {S.G.P. Ajgaonkar},
     title = {A {Note} on {Horvitz's} and {Thompson's} {T3} {Class} of {Linear} {Estimators}},
     journal = {Metrika},
     pages = {16--21},
     year = {1967},
     volume = {12},
     zbl = {0173.20503},
     url = {http://geodesic.mathdoc.fr/item/MET_1967__12_175338/}
}