1. Atanassov, K.T.: Intuitionistic Fuzzy Sets. Physica-Verlag, Heidelberg, New York (1999)
2. Barrenechea, E.: Image Processing with Interval-Valued Fuzzy Sets. Edge Detection. Contrast, Ph.D. Thesis. Universidad Pública de Navarra (2005)
3. Bedregal, B., Mezzomo, I., Reiser, R.H.S.: n-Dimensional fuzzy negations. IEEE Trans. Fuzzy Syst. 26(6), 3660–3672 (2018)
4. Bustince, H., Montero, J., Pagola, M., Barrenechea, E., Gómez, D.: A survey of interval-valued fuzzy sets. In: Handbook of Granular Computing, Chapter 22, pp. 491–515 . Wiley, West Sussex (2008)
5. Cubillo, S., Castiñeira, E., Montilla, W.: Supplementarity measures on fuzzy sets. In: Proceedings of the Conference EUSFLAT-LFA 2011, Aix-les-Bains, pp. 897–903 (2011)