• Minimal non-ergodic (C^1)-diffeomorphisms of the circle 

      Oliveira, Fernando; Rocha, Luiz Fernando Carvalho da (2001) [Artigo de periódico]
      We construct, for each irrational number α, a minimal C1-diffeomorphismof the circle with rotation number α which is not ergodic with respect to the Lebesgue measure.