@article{700605,
title = {The category of all zero-dimensional realcompact spaces is not simple},
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 = {[327]-328},
mrnumber = {MR0464169},
zbl = {0365.54010},
url = {http://dml.mathdoc.fr/item/700605}
}
Mysior, A. The category of all zero-dimensional realcompact spaces is not simple, dans General topology and its relations to modern analysis and algebra IV, GDML_Books, (1977), pp. [327]-328. http://gdmltest.u-ga.fr/item/700605/