@article{AM2_1997__54_3_137709,
     author = {J\'anos C. Fodor and Jean-Luc Marichal},
     title = {On nonstrict means.},
     journal = {Aequationes mathematicae},
     pages = {308--327},
     year = {1997},
     volume = {54},
     number = {3},
     zbl = {0907.39021},
     url = {http://geodesic.mathdoc.fr/item/AM2_1997__54_3_137709/}
}