[1] Bandemer H., Näther W.: Fuzzy Data Analysis. Kluwer, Dordrecht 1992 MR 1175172 | Zbl 0758.62003

[2] Dubois D., Kerre E., Mesiar R., Prade H.: Fuzzy Interval Analysis. In: Fundamentals of Fuzzy Sets (D. Dubois, H. Prade, eds.), Kluwer, Boston 2000 MR 1890240 | Zbl 0988.26020

[3] Klir G., Yuan B.: Fuzzy Sets and Fuzzy Logic – Theory and Applications. Prentice Hall, Upper Saddle River, N.J. 1995 MR 1329731 | Zbl 0915.03001

[4] Menger K.: Ensembles flous et fonctions aléatoires, Comptes Rendus Acad. Sci. 232 (1951), 2001–2003 MR 0042082

[5] Nguyen H.: A note on the extension principle for fuzzy sets, J. Math. Anal. Appl. 64 (1978), 369–380 MR 0480044

[6] Viertl R.: Statistical Methods for Non–Precise Data. CRC Press, Boca Raton 1996 MR 1382865 | Zbl 0853.62004

[7] Viertl R.: Non–Precise Data (Encyclopedia Math. Suppl. II). Kluwer, Dordrecht 2000

[8] Viertl R.: Statistical Inference with Non-Precise Data. In: Encyclopedia of Life Support Systems, UNESCO, Paris, to appear on-line

[9] Zadeh L.: Fuzzy sets. Information and Control 8 (1965), 338–353 MR 0219427 | Zbl 0139.24606

[10] Zadeh L.: The concept of a linguistic variable and its applications to approximate reasoning. Parts I, II, III. Inform. Sci. 8 (1975), 199–249 MR 0386369