K. Atanassov,Intuitionistic fuzzy sets, Fuzzy Sets and Systems, 20 (1986), 87-96.
 K. Atanassov,Operators over interval-valued intuitionistic fuzzy sets, Fuzzy Sets and Sys-tems,
64 (1994), 159-174.
 K. Atanassov,On intuitionistic fuzzy negations and De Morgan Laws, Proceedings of
Eleventh International Conference, IPMU 2006, Paris, July 2-7, (2006), 2399-2404.
 K. Atanassov and G. Gargov,Interval-valued intuitionistic fuzzy sets
, Fuzzy Sets and Sys-tems,31 (1989), 343-349.
 R. A. Borzooei and Y. B. Jun,Intuitionistic fuzzy hyper BCK-ideals of hyper BCK-algebras
,Iranian Journal of Fuzzy Systems,1 (2004), 65-78.
 H. Bustince and P. Burillo,Correlation of interval-valued intuitionistic fuzzy sets, Fuzzy Sets
and Systems,74 (1995), 237-244.
 Q. Chen, Z. S. Xu, S. S. Liu and X. H. Yu,A method based on interval-valued intuitionistic
fuzzy entropy for multiple attribute decision making, Information: An International Interdis-
ciplinary Journal,13 (2010), 67-77.
 D. Coker,Fuzzy rough sets are intuitionistic L-fuzzy sets, Fuzzy Sets and Systems, 96
 G. Deschrijver,Arithmetic operators in interval-valued fuzzy set theory, Information Sciences,
177 (2007), 2906-2924.
 J. Garcia and S. E. Rodabaugh, Order-theoretic, topological, categorical redundancies of
interval-valued sets, grey sets, vague sets, interval-valued intuitionistic sets, intuitionistic
fuzzy sets and topologies , Fuzzy Sets and Systems, 156 (2005), 445-484.
 J. Goguen,L-fuzzy sets, Journal of Mathematical Analysis and Applications, 18(1967),145-174.
 H. L. Huang and F. G. Shi,L-fuzzy numbers and their properties, Information Sciences,
 W. L. Hung and J. W. Wu,Correlation of intuitionistic fuzzy sets by centroid method
,Information Sciences,144 (2002), 219-225.
 Y. Jiang, Y. Tang, J. Wang and S. Tang,Reasoning within intuitionistic fuzzy rough descrip-
tion logics, Information Sciences, 189 (2009), 2362-2378.
 A. Khan, Y. B. Jun and M. Shabir,Ordered semigroups characterized by their intuitionistic
fuzzy BI-ideals, Iranian Journal of Fuzzy Systems, 7(2010), 55-69.
 M. L. Lin and H. L. Huang,(T,S)-based intuitionistic fuzzy composite matrix and its appli-cation
, International Journal of Applied Mathematics and Statistics, 23 (2011), 54-63.
 T. K. Mondal and S. K. Samanta,Topology of interval-valued intuitionistic fuzzy sets, Fuzzy
Sets and Systems,119 (2001), 483-494.
 A. Narayanan, S. Vijayabalaji and N. Thillaigovindan,Intuitionistic fuzzy bounded linear
operators, Iranian Journal of Fuzzy Systems, 4 (2007), 89-101.
 D. G. Park, Y. C. Kwun, J. H. Park and et al.,Correlation coecient of interval-valued intu-
itionistic fuzzy sets and its application to multiple attribute group decision making problems
,Mathematical and Computer Modelling, 50 (2009), 1279-1293.
 L. Torkzadeh, M. Abbasi and M. M. Zahedi,Some results of intuitionistic fuzzy weak dual
hyper K-ideals, Iranian Journal of Fuzzy Systems, 5(2008), 65-78.
 P. Z. Wang,Fuzzy set theory and its application, Shanghai Science and Technology Press,
 Z. Wang, K. W. Li and W. Wang, An approach to multiattribute decision making with
interval-valued intuitionistic fuzzy assessments and incomplete weights, Information Sciences,179
 G. Wei,Some induced geometric aggregation operators with intuitionistic fuzzy information
and their application to group decision making , Applied Soft Computing, 10 (2010), 423-431.
 Z. S. Xu,A method based on distance measure for interval-valued intuitionistic fuzzy group
decision making, Information Sciences, 180 (2010), 181-190.
 Z. S. Xu,Choquet integrals of weighted intuitionistic fuzzy information, Information Sciences,
180 (2010), 726-736.
 Z. S. Xu,A deviation-based approach to intuitionistic fuzzy multiple attribute group decision
making, Group Decision and Negotiation, 19 (2010), 57-76.
 Z. S. Xu,On correlation measures of intuitionistic fuzzy sets, Lecture Notes in Computer Science,
4224 (2006), 16-24.
 Z. S. Xu,Intuitionistic fuzzy hierarchical clustering algorithms, Journal of Systems Engineer-
ing and Electronics,20 (2009), 90-97.
 Z. S. Xu and X. Cai,Incomplete interval-valued intuitionistic preference relations
, Interna-tional Journal of General Systems, 38 (2009), 871-886.
 Z. S. Xu and X. Q. Cai, Nonlinear optimization models for multiple attribute group decision
making with intuitionistic fuzzy information, International Journal of Intelligent Systems, 25 (2010),
 Z. S. Xu and J. Chen,Approach to group decision making based on interval-valued intuition-
istic judgment matrices, Systems Engineering-Theory and Practice, 27(4) (2007), 126-133.
 Z. S. Xu, J. Chen and J. Wu,Clustering algorithm for intuitionistic fuzzy sets, InformationSciences,
178 (2008), 3775-3790.
 Z. S. Xu and J. J. Wu,Intuitionistic fuzzy c-means clustering algorithms, Journal of Systems
Engineering and Electronics, 21 (2010), 580-590.
 Z. S. Xu and R. R. Yager,Dynamic intuitionistic fuzzy multi-attribute decision making,
International Journal of Approximate Reasoning,48 (2008), 246-262.
 Z. S. Xu and R. R. Yager,Intuitionistic and interval-valued intutionistic fuzzy preference
relations and their measures of similarity for the evaluation of agreement within a group
,Fuzzy Optimization and Decision Making,8 (2009), 123-139.
 J. Ye and Multicriteria,Fuzzy decision-making method based on a novel accuracy function
under interval-valued intuitionistic fuzzy environment, Expert Systems with Applications,
 J. Ye and Multicriteria,Fuzzy decision-making method using entropy weights-based correla-
tion coecients of interval-valued intuitionistic fuzzy sets, Applied Mathematical Modelling,
 L. A. Zadeh,Fuzzy sets, Information Control, 8 (1965), 338-353.
 H. M. Zhang, Z. S. Xu and Q. Chen,On clustering approach to intuitionistic fuzzy sets
,Control and Decision,22 (2007), 882-888.
 H. Y. Zhang, W. X. Zhang and W. Z. Wu,On characterization of generalized interval-
valued fuzzy rough sets on two universes of discourse, International Journal of Approximate
Reasoning,51 (2009), 56-70.
 L. Zhou, W. Z. Wu and W. X. Zhang,On characterization of intuitionistic fuzzy rough sets
based on intuitionistic fuzzy implicators, Information Sciences, 179 (2009), 883-898.