FUZZY SETS AND SYSTEMS, vol.155, no.3, pp.459-463, 2005 (SCI-Expanded)
In this paper, we shall give an answer to show that an open problem, which is collected by Klement et al. in "Problems on triangular norms and related operators" [Fuzzy Sets and Systems 145 (2004) 471-479], has a negative solution. (c) 2005 Elsevier B.V. All rights reserved.