C. Mosquera, Pérez-González, F., and López-Valcarce, R., Hyperstable polyphase adaptive IIR filters, in IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Phoenix, AZ, USA, 1999, vol. 4, pp. 1841–1844.
C. Mosquera, Gómez, J. A., Pérez-González, F., and Sobreira, M., IIR adaptive filters for active noise control, in International Congress on Sound and Vibration, Copenhagen, Denmark, 1999.
C. Mosquera, Leyra, L., and Pérez-González, F., The robust SPR problem: design algorithms and new applications, Signal Processing, vol. 76, pp. 269-283, 1999.