@article{700709,
     title = {Ordinal invariants in topology - summary},
     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 = {[197]-206},
     mrnumber = {MR0470924},
     zbl = {0371.54013},
     url = {http://dml.mathdoc.fr/item/700709}
}

Kannan, V. Ordinal invariants in topology - summary, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. [197]-206. http://gdmltest.u-ga.fr/item/700709/