@book{15011, author = {Bardos, C.}, title = {Bifurcation and nonlinear eigenvalue problems :}, publisher = {Springer-Verlag,}, year = {1980.}, series = {Lecture notes in mathematics ; 782}, address = {Berlin ;}, note = {English or French.}, url = {http://www.loc.gov/catdir/enhancements/fy1001/80011358-t.html} }