Soft Computing in Financial Engineering ; Editors Rita Almeida Ribeiro, Hans-Jürgen Zimmermann, Ronald R. Yager, Janusz Kacprzyk. - Heidelberg : Physica-Verlag, 1999. - tab. obr. v texte. - 506 s. ; 24 cm. - (Studies in fuziness and soft computing ; Vol. 28). - ISBN 3-7908-1173-4.