@article{PORMA_1998__55_1_47931,
     author = {Korman, Ph.},
     title = {Remarks on {Nagumo's} condition.},
     journal = {Portugaliae mathematica},
     pages = {1--9},
     publisher = {mathdoc},
     volume = {55},
     number = {1},
     year = {1998},
     zbl = {0894.34015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1998__55_1_47931/}
}