@article{GDZPPN001173685,
title = {A Counterexample to Greenberg's Algorithm for Solving Linear Inequalities.},
journal = {Numerische Mathematik},
volume = {26},
year = {1976},
pages = {491-492},
zbl = {0358.65059},
url = {http://dml.mathdoc.fr/item/GDZPPN001173685}
}
Sherman, B.F. A Counterexample to Greenberg's Algorithm for Solving Linear Inequalities.. Numerische Mathematik, Tome 26 (1976) pp. 491-492. http://gdmltest.u-ga.fr/item/GDZPPN001173685/