Audio steganography by amplitude or phase modification. - Kaliappan Gopalan; Stanley J. Wenndt; Scott F. Adams; Darren M. Haddad (Security and Watermarking of Multimedia Contents, 2003)

Speech coding using the matrix pencil. - Darren M. Haddad; Tapan K. Sarkar; Andrew J. Noga (SIP, 2007)