Some references:
E. Kropat and G.-W. Weber, Fuzzy Regression Analysis for Target-Environment Networks – Prediction Strategies for Fuzzy Evolving Networks (NACO 8, 2 (May 2018) 135–155). ----
G.-W. Weber, S.Z. Alparslan Gök and E. Kropat, Recent advances on ellipsoidal cooperative games, Extended Abstract, in: The Fifth International Conference Game Theory and Management, GTM 2011, St. Petersburg,
... [Show full abstract] June 27-29, 2011, Abstracts, L.A. Petrosyan and N.A. Zenkevich (eds.), St. Petersburg University (Graduate School of Management and Faculty of Applied Mathematics & Control Processes), and The International Society of Dynamic Games (ISDG) (Russian Chapter) 255-257. ----
G.-W. Weber, R. Branzei and S.Z. Alparslan Gök, On the ellipsoidal core for cooperative games under ellipsoidal uncertainty, in the proceedings of 2nd International Conference on Engineering Optimization (Lisbon, Portugal, September 6-9, 2010) (on a CD-Rom) 1-6; http://www1.dem.ist.utl.pt/engopt2010/Book_and_CD/Papers_CD_Final_Version/pdf/10/01446-01.pdf.