@article{05036722, title = {Sufficient conditions for }, journal = {General Mathematics}, volume = {12}, year = {2004}, pages = {61-66}, zbl = {1092.30023}, language = {en}, url = {http://dml.mathdoc.fr/item/05036722} }
Holhoş, Viorel Cosmin. Sufficient conditions for . General Mathematics, Tome 12 (2004) pp. 61-66. http://gdmltest.u-ga.fr/item/05036722/