Separation of drums from polyphonic music using non-negative matrix factorization and support vector machine. - Marko Leonard Helén; Tuomas Virtanen (EUSIPCO, 2005)

Modeling musical sounds with an interpolating state model. - Anssi Klapuri; Tuomas Virtanen; Marko Leonard Helén (EUSIPCO, 2005)

Query by Example of Audio Signals using Euclidean Distance Between Gaussian Mixture Models. - Marko Leonard Helén; Tuomas Virtanen (ICASSP (1), 2007)

On enabling techniques for personal audio content management. - Tommi Lahti; Marko Leonard Helén; Olli Vuorinen; Eero Väyrynen; Juha Partala; Johannes Peltola; Satu-Marja Mäkelä (Multimedia Information Retrieval, 2008)

Similarity Measures for Content-Based Audio Retrieval. - Marko Leonard Helén (2009)

Audio Query by Example Using Similarity Measures between Probability Density Functions of Features. - Marko Leonard Helén; Tuomas Virtanen (EURASIP J. Audio Speech Music. Process., 2010)