@article{702186,
     title = {Nonlinear boundary-value problems for differential equations},
     booktitle = {Differential Equations and Their Applications},
     series = {GDML\_Books},
     publisher = {Publishing House of the Czechoslovak Academy of Sciences},
     address = {Prague},
     year = {1963},
     pages = {199-215},
     mrnumber = {MR0173072},
     zbl = {0196.40102},
     url = {http://dml.mathdoc.fr/item/702186}
}

Vejvoda, O. Nonlinear boundary-value problems for differential equations, dans Differential Equations and Their Applications, GDML_Books,  (1963), pp. 199-215. http://gdmltest.u-ga.fr/item/702186/