Kir, E., Bascanbaz-Tunca, G., & Yanik, C. (2017). Spectral properties of a non selfadjoint system of differential equations with a spectral parameter in the boundary condition. Proyecciones (Antofagasta, On Line), 24(1), 49-63. https://doi.org/10.4067/10.4067/S0716-09172005000100005