Perturbation of Zeros of the Selberg Zeta Function for Γ0(4). - Roelof Bruggeman; Markus Fraczek; Dieter Mayer (Exp. Math., 2013)

Near-Integrability and Recurrence in FPU Chains with Alternating Masses. - Roelof Bruggeman; Ferdinand Verhulst (J. Nonlinear Sci., 2019)