Random Sets and Histograms. - Javier Nunez-Garcia; Olaf Wolkenhauer (FUZZ-IEEE, 2001)

Random set system identification. - Javier Nunez-Garcia; Olaf Wolkenhauer (IEEE Trans. Fuzzy Syst., 2002)

Level sets and minimum volume sets of probability density functions. - Javier Nunez-Garcia; Zoltán Kutalik; Kwang-Hyun Cho; Olaf Wolkenhauer (Int. J. Approx. Reason., 2003)