@article{10_21136_MB_2011_141693,
     author = {Graef, John R. and Kong, Lingju and Kong, Qingkai and Yang, Bo},
     title = {Second order boundary value problems with sign-changing nonlinearities and nonhomogeneous boundary conditions},
     journal = {Mathematica Bohemica},
     pages = {337--356},
     publisher = {mathdoc},
     volume = {136},
     number = {4},
     year = {2011},
     doi = {10.21136/MB.2011.141693},
     mrnumber = {2985544},
     zbl = {1249.34055},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2011.141693/}
}