@article{LJM_2005_17_a2,
     author = {M. Benalili},
     title = {On a class of non linear differential operators of first order with singular point},
     journal = {Lobachevskii journal of mathematics},
     pages = {25--41},
     publisher = {mathdoc},
     volume = {17},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2005_17_a2/}
}