@article{MZM_1980_28_4_a15,
     author = {G. I. Ivchenko and E. E. Timonina},
     title = {Estimation in sampling from a finite population},
     journal = {Matemati\v{c}eskie zametki},
     pages = {623--633},
     publisher = {mathdoc},
     volume = {28},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_28_4_a15/}
}