@article{KYB_2011_47_6_a2,
     author = {Gy\"orfi, L\'aszl\'o and Krzy\.zak, Adam},
     title = {Why $L_1$ view and what is next?},
     journal = {Kybernetika},
     pages = {840--854},
     year = {2011},
     volume = {47},
     number = {6},
     mrnumber = {2907845},
     zbl = {06047589},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2011_47_6_a2/}
}