1. Zhang T, Kuo CCJ: Hierarchical classification of audio data for archiving and retrieving. In Proceedings of ICASSP. Phoenix; 15–19 March 1999:3001-3004.
2. Helén M, Virtanen T: Query by example of audio signals using Euclidean distance between Gaussian Mixture Models. In Proceedings of ICASSP. Honolulu; 15–20 April 2007:225-228.
3. Helén M, Virtanen T: Audio query by example using similarity measures between probability density functions of features. EURASIP J. Audio Speech Music Process 2010, 2010: 2:1-2:12.
4. Tzanetakis G, Ermolinskyi A, Cook P: Pitch histograms in audio and symbolic music information retrieval. In Proceedings of the Third International Conference on Music Information Retrieval: ISMIR. Paris; 2002:31-38.
5. Tsai HM, Wang WH: A query-by-example framework to retrieve music documents by singer. In Proceedings of the IEEE International Conference on Multimedia and Expo. Taipei; 27–30 June 2004:1863-1866.