@article{GDZPPN00125782X,
title = {A note on the location of joint discontinuity.},
journal = {Semigroup forum},
volume = {31},
year = {1985},
pages = {173-182},
zbl = {0578.57013},
url = {http://dml.mathdoc.fr/item/GDZPPN00125782X}
}
Ruppert, W. A note on the location of joint discontinuity.. Semigroup forum, Tome 31 (1985) pp. 173-182. http://gdmltest.u-ga.fr/item/GDZPPN00125782X/