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Ruiz-García, G and Hagras, H and Rojas, I and Pomares, H (2017) 'Towards a framework for singleton general forms of interval type-2 fuzzy systems.' Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 10147 . pp. 3-26. ISSN 0302-9743

Ruiz, G and Hagras, H and Pomares, H and Rojas, I and Bustince, H (2016) 'Join and Meet Operations for Type-2 Fuzzy Sets With Nonconvex Secondary Memberships.' IEEE Transactions on Fuzzy Systems, 24 (4). pp. 1000-1008. ISSN 1063-6706

Cara, AB and Wagner, C and Hagras, H and Pomares, H and Rojas, I (2013) 'Multiobjective Optimization and Comparison of Nonsingleton Type-1 and Singleton Interval Type-2 Fuzzy Logic Systems.' IEEE Transactions on Fuzzy Systems, 21 (3). pp. 459-476. ISSN 1063-6706