Hopf bifurcation theorem for evolution equations of hyperbolic type /

gan Neves, Aloisio Freiria., Ribeiro, Hermano De Souza.
Cyhoeddwyd 1988.

On the spectrum of evolution operators generated by hyperbolic systems /

gan Neves, Aloisio Freiria., Ribeiro, Hermano De Souza., Lopes, Orlando.
Cyhoeddwyd 1985.