1. Zadeh, L.A.: A Note on Z-numbers. . Inf. Sci. 14(181), 2923–2932 (2011)
2. Aliev, R.К., Huseynov, O.H., Aliyeva, K.R.: Aggregation of an expert group opinion under Z-information. In: Proceedings of the Eighth International Conference on Soft Computing, Computing with Words and Perceptions in System Analysis, Decision and Control, Budva, Montenegro, August 2015, pp 115–124 (2015)
3. Aliev, R.A., Alizadeh, A.V., Huseynov, O.H.: The arithmetic of discrete Z-numbers. Inform. Sci. 290(1), 134–155 (2015)
4. Aliev, R.A., Huseynov, O.H., Zeinalova, L.M.: The arithmetic of continuous Z-numbers. Inform. Sci. 373, 441–460 (2016)
5. Dutta, P., Boruah, H., Ali, T.: Fuzzy arithmetic with and without - cut method: A comparative study. Int. J. Latest Trends Comput. 2(1), 99–107 (2011)