L.A. zadeh (1965) : ‘ Fuzzy Sets’, Information and Control 8(3) : pp 338-353
G.J. Klir and Bo Yuan : ‘ Fuzzy Sets and fuzzy logic, Theory and Information ’ Prentice Hall of India Private Limited, New Delhi (2006)
C. Jaisankar and S. Arunavasan : ‘ Adjoint of Triangular fuzzy number matrices ’ International J of Mathematics Archive 9(2) – 2018 pp 72-78
R.K. Das and SanjeevKumar : ‘ On intuitionistic triangular fuzzy numbers ’ South East Asian J of Mathematics and Mathematical Sciences, Vol. – 15 No. – 1 (2019) pp 63-70
H.J. Zimmermann : ‘ Fuzzy Set theory and its application (Second Edition) ’ Kluwer Academic Publishers, New Delhi (1996)
Shiv Raj Singh : ‘ Fuzzy Set Theory ’ Third Edition (2014), Krishna Prakashan Media, Private limited, Meerut (India) pp 35-56
S. Pundir and R. Pundir : ‘ Fuzzy Sets and their application, PragatiPrakashan, Fourth Edition (2012) ’