@incollection{cristea,
booktitle="Hypergroups and $n$-ary relations",
%doi="10.1016/j.ejc.2009.07.005",
title="Soft Computing-Based Recognition of Musical Sounds",
publisher="European Journal of Combinatorics",
year="2009",
author="H. Cristea and  M. Stefaneseu"
}

@incollection{12,
year="1998",
booktitle="Rough Sets in Knowledge Discovery 2",
volume="19",
series="Studies in Fuzziness and Soft Computing",
editor=" Lech, P. and  Andrzej, S.",
%doi="10.1007/978-3-7908-1883-3_11",
title="Soft Computing-Based Recognition of Musical Sounds",
%url="http://dx.doi.org/10.1007/978-3-7908-1883-3_11",
publisher="Physica-Verlag HD",
author="K. Bozena",
pages="193-213"
}