TY - JOUR AU - Tisdell, Christopher C. TI - On the solvability of nonlinear first-order boundary-value problems JO - Electronic journal of differential equations PY - 2006 VL - 2006 UR - http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a19/ LA - en ID - EJDE_2006__2006__a19 ER -