@article{1102970259, author = {Hartfiel, D. J.}, title = {Counterexamples to a conjecture of G. N. de Oliveira.}, journal = {Pacific J. Math.}, volume = {39}, number = {3}, year = {1971}, pages = { 67-68}, language = {en}, url = {http://dml.mathdoc.fr/item/1102970259} }
Hartfiel, D. J. Counterexamples to a conjecture of G. N. de Oliveira.. Pacific J. Math., Tome 39 (1971) no. 3, pp. 67-68. http://gdmltest.u-ga.fr/item/1102970259/