@article{KYB_2005_41_3_a0,
     author = {Drewniak, J\'ozef and Dudziak, Urszula},
     title = {Aggregations preserving classes of fuzzy relations},
     journal = {Kybernetika},
     pages = {265--284},
     year = {2005},
     volume = {41},
     number = {3},
     mrnumber = {2181418},
     zbl = {1249.03092},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2005_41_3_a0/}
}