Citation: Rn. Cruz et Ka. Derezende, CYCLE RANK OF LYAPUNOV GRAPHS AND THE GENERA OF MANIFOLDS, Proceedings of the American Mathematical Society, 126(12), 1998, pp. 3715-3720
Citation: Ka. Derezende et Rd. Franzosa, LYAPUNOV GRAPHS AND FLOWS ON SURFACES, Transactions of the American Mathematical Society, 340(2), 1993, pp. 767-784