@article{EP_2012_36_a17,
     author = {Janusz Matkowski},
     title = {Invariant graphs of functions for the mean-type mappings},
     journal = {ESAIM. Proceedings},
     pages = {209--216},
     publisher = {mathdoc},
     volume = {36},
     year = {2012},
     doi = {10.1051/proc/201236017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/proc/201236017/}
}