@article{700697,
     title = {The fixed point property of superextensions},
     booktitle = {General topology and its relations to modern analysis and algebra IV},
     series = {GDML\_Books},
     publisher = {Society of Czechoslovak Mathematicians and Physicist},
     address = {Praha},
     year = {1977},
     pages = {[477]-480},
     mrnumber = {MR0645169},
     zbl = {0372.54021},
     url = {http://dml.mathdoc.fr/item/700697}
}

van der Vel, M. The fixed point property of superextensions, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. [477]-480. http://gdmltest.u-ga.fr/item/700697/