@article{700708,
     title = {Separation and connectedness},
     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 = {[90]-94},
     mrnumber = {MR0474196},
     zbl = {0371.54004},
     url = {http://dml.mathdoc.fr/item/700708}
}

Császár, K. Separation and connectedness, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. [90]-94. http://gdmltest.u-ga.fr/item/700708/