@article{EJDE_2006__2006__a19,
     author = {Tisdell, Christopher C.},
     title = {On the solvability of nonlinear first-order boundary-value problems},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2006},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a19/}
}