@article{1181073056, author = {Hankerson, Darrel}, title = {Right and left disconjugacy in difference equations}, journal = {Rocky Mountain J. Math.}, volume = {20}, number = {4}, year = {1990}, pages = { 987-995}, language = {en}, url = {http://dml.mathdoc.fr/item/1181073056} }
Hankerson, Darrel. Right and left disconjugacy in difference equations. Rocky Mountain J. Math., Tome 20 (1990) no. 4, pp. 987-995. http://gdmltest.u-ga.fr/item/1181073056/