@article{700666,
     title = {Set transformations with centralizers formed by closed deformations of quasi-discrete topological  spaces},
     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 = {[83]-89},
     mrnumber = {MR0500872},
     zbl = {0372.54038},
     url = {http://dml.mathdoc.fr/item/700666}
}

Chvalina, J. Set transformations with centralizers formed by closed deformations of quasi-discrete topological  spaces, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. [83]-89. http://gdmltest.u-ga.fr/item/700666/