@article{KYB_1991_27_2_a1,
     author = {Hipp, Christian},
     title = {Efficient estimation under constraints},
     journal = {Kybernetika},
     pages = {100--113},
     year = {1991},
     volume = {27},
     number = {2},
     mrnumber = {1106781},
     zbl = {0739.62030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1991_27_2_a1/}
}