Recursive least-squares approach to self-organizing maps. - Vesa T. Ruoppila; Timo Sorsa; Heikki N. Koivo (ICNN, 1993)

Genetic annealing search for index assignment in vector quantization. - Tomasz Ostrowski; Vesa T. Ruoppila (Pattern Recognit. Lett., 1997)

Waveform extraction for perfect reconstruction in WI coding. - Vesa T. Ruoppila; Mikko Tammi; Jukka Saarinen (ICASSP, 2000)

Coding method for successive pitch periods. - Ari Heikkinen; Vesa T. Ruoppila; Samuli Pietilä (INTERSPEECH, 2001)

Signal Modification Method for Variable Bit Rate Wide-band Speech Coding. - Mikko Tammi; Milan Jelinek; Vesa T. Ruoppila (IEEE Trans. Speech Audio Process., 2005)