Variable biquadratic digital filter section with simultaneous tuning of the pole and zero frequencies by a single parameter. - Georgi Stoyanov; Masayuki Kawamata (ISCAS (3), 2003)

Efficient design of adaptive complex narrowband IIR filters. - Georgi Iliev; Zlatka Nikolova; Georgi Stoyanov; Karen O. Egiazarian (EUSIPCO, 2004)

High tuning accuracy design of variable IIR filters as a cascade of identical sub-filters. - Georgi Stoyanov; Masayuki Kawamata; I. Uzunov (ISCAS (4), 2005)

Noise Cancellation in OFDM Systems Using Adaptive Complex Narrowband IIR Filtering. - Georgi Iliev; Zlatka Nikolova; Vladimir Poulkov; Georgi Stoyanov (ICC, 2006)

Low-sensitivity design and implementation of allpass based fractional delay digital filters. - Kamelia Nikolova; Georgi Stoyanov; Masayuki Kawamata (ECCTD, 2009)

Accuracy improvement of real-poles allpass-based digital Hilbert transformers. - Kamelia Nikolova; Georgi Stoyanov (Int. J. Reason. based Intell. Syst., 2014)