@article{702381,
     title = {On some boundary value problems for systems of nonlinear ordinary differential equations},
     booktitle = {Equadiff 7},
     series = {GDML\_Books},
     publisher = {BSB B.G. Teubner Verlagsgesellschaft},
     address = {Leipzig},
     year = {1990},
     pages = {37-46},
     zbl = {0715.34029},
     url = {http://dml.mathdoc.fr/item/702381}
}

Kiguradze, I. On some boundary value problems for systems of nonlinear ordinary differential equations, dans Equadiff 7, GDML_Books,  (1990), pp. 37-46. http://gdmltest.u-ga.fr/item/702381/