@article{MET_1975__22_175683,
     author = {A. Chaudhuri},
     title = {Some {Results} {Concerning} {Horvitz-Thompson} 's {Tl} {-Class} of {Estimators.}},
     journal = {Metrika},
     pages = {217--224},
     publisher = {mathdoc},
     volume = {22},
     year = {1975},
     zbl = {0344.62008},
     url = {http://geodesic.mathdoc.fr/item/MET_1975__22_175683/}
}