@article{KYB_1984_20_3_a1,
     author = {Vajda, Igor},
     title = {Motivation, existence and equivariance of $D$-estimators},
     journal = {Kybernetika},
     pages = {189--208},
     year = {1984},
     volume = {20},
     number = {3},
     mrnumber = {763646},
     zbl = {0558.62026},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1984_20_3_a1/}
}