Fuh, C. F., Jea, R., and Su, J. S., Fuzzy system reliability analysis based on level (λ, 1) interval valued fuzzy sets, Information Sciences, 272 (2014), pp. 185-197.
Smarandache, F. A unifying field in logics, neutrosophy: neutrosophic probability, set and logic, Rehoboth: American Research Press, (1999).
Wang, H., Madiraju, P., Zhang, Y., and Sunderraman, R., Interval neutrosophic sets, (2004). [Online] Available: xxx.lanl.gov/pdf/math.GM/0409113.