@article{04146426, title = {A necessary and sufficient condition for uniqueness of solutions of singular differential inequalities.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {13}, year = {1990}, pages = {253-270}, doi = {10.1155/S0161171290000382}, zbl = {0699.34014}, language = {en}, url = {http://dml.mathdoc.fr/item/04146426} }
Lair, Alan V. A necessary and sufficient condition for uniqueness of solutions of singular differential inequalities.. International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990) pp. 253-270. doi : 10.1155/S0161171290000382. http://gdmltest.u-ga.fr/item/04146426/