@article{701259,
     title = {On medial properties of maps},
     booktitle = {Proceedings of the 10th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1982},
     pages = {[21]-33},
     mrnumber = {MR0683766},
     zbl = {0574.54010},
     url = {http://dml.mathdoc.fr/item/701259}
}

Čerin, Zvonko. On medial properties of maps, dans Proceedings of the 10th Winter School on Abstract Analysis, GDML_Books,  (1982), pp. [21]-33. http://gdmltest.u-ga.fr/item/701259/