1. Babenko, K.I., On properties of steady viscous incompressible fluid flows. Approximation methods for Navier-Stokes problems (Proc. Sympos., Univ. Paderborn, Paderborn, 1979), pp. 12–42, Lecture Notes in Math., Vol. 771, Springer, Berlin, 1980
2. Babenko, K. I., On the spectrum of a linearized problem of flow of a viscous incompressible fluid around a body (Russian), Dokl. Akad. Nauk SSSR, 262 64–68 (1982)
3. Babenko, K.I., Periodic solutions of a problem of the flow of a viscous fluid around a body, Soviet Math. Dokl.25 211–216 (1982)
4. Crispo, F. and Maremonti, P., An interpolation inequality in exterior domains, Rend. Sem. Mat. Univ. Padova, 112 11–39 (2004)
5. Crandall, M.G., and Rabinowitz, P.H., The Hopf bifurcation theorem in infinite dimensions, Arch. Ration. Mech. Anal., 67 (1977) 53–72