A hybrid pre-whitening technique for detection of additive spread spectrum watermarks in audio signals. - Krishna Kumar S.; Thippur Sreenivas (EUSIPCO, 2006)

Non-negative durational HMM. - Jarle Bauck Hamar; Doddipatla Rama Sanand; Torbjørn Svendsen; Thippur Sreenivas (MLSP, 2013)