@article{MET_1986__33_176062,
     author = {E. von Collani},
     title = {a-Optimal {Sampling} {Plans} for {Large} {Acceptance} {Numbers.}},
     journal = {Metrika},
     pages = {257--273},
     publisher = {mathdoc},
     volume = {33},
     year = {1986},
     zbl = {0611.62126},
     url = {http://geodesic.mathdoc.fr/item/MET_1986__33_176062/}
}