@article{700429,
     title = {Multiple solutions of nonlinear boundary value problems for equations with critical points},
     booktitle = {Proceedings of Equadiff 11},
     series = {GDML\_Books},
     publisher = {Comenius University Press},
     address = {Bratislava},
     year = {2007},
     pages = {333-342},
     url = {http://dml.mathdoc.fr/item/700429}
}

Ogorodnikova, Svetlana. Multiple solutions of nonlinear boundary value problems for equations with critical points, dans Proceedings of Equadiff 11, GDML_Books,  (2007), pp. 333-342. http://gdmltest.u-ga.fr/item/700429/