@article{KYB_2004__40_1_a3,
     author = {Narukawa, Yasuo and Torra, Vicen\c{c}},
     title = {Twofold integral and multi-step {Choquet} integral},
     journal = {Kybernetika},
     pages = {[39]},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {2004},
     mrnumber = {2068597},
     zbl = {1249.28027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2004__40_1_a3/}
}