@article{700737,
     title = {On pseudo-open mappings},
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1972},
     pages = {469-470},
     mrnumber = {MR0353243},
     zbl = {0337.54007},
     url = {http://dml.mathdoc.fr/item/700737}
}

Zaremba, D. On pseudo-open mappings, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1972), pp. 469-470. http://gdmltest.u-ga.fr/item/700737/