Single and double frame quantization of LSF parameters using noise feedback coding. - Ahmad R. Fazel; Amir K. Khandani (ICC, 2001)

Single and double frame coding of speech LPC parameters using a lattice-based quantization scheme. - Farshad Lahouti; Ahmad R. Fazel; A. H. Safavi-Naeini; Amir K. Khandani (IEEE Trans. Speech Audio Process., 2006)