[1] Adabitabar Firozja M., Firouzian S. (2015). ``Fuzzy number-valued fuzzy relation", International Journal of Industrial Mathematics, 7(4), Article ID IJIM-00654, 7 pages.
[2] Akram M. (2011). ``Bipolar fuzzy graphs", Information Sciences, 181, 5548-5564.
[3] Akram M., Dudek W. A. (2011). ``Interval-valued fuzzy graphs", Computers and Mathematics with Applications, 61, 289-299.
[4] Akram M. (2013). ``Bipolar fuzzy graphs with applications", Knowledge-Based Systems, 39, 1-8.
[5] Bede B., Stefanini L. ``Generalized Differentiability of Fuzzy-valued Functions", Fuzzy Sets and Systems (to appear): $http://ideas.repec.org/p/urb/wpaper/1209.html$.
[6] Bede B. (2013). ``Mathematics of Fuzzy Sets and Fuzzy Logic", Springer.
[7] Coroianu L. (2012). ``Lipschitz functions and fuzzy number approximations", Fuzzy Sets and Systems, 200, 116-135.
[8] Friedrich E., Martin N. (2012). ``Colouring fuzzy circular interval graphs", European Journal of Combinatorics, 33, 893-904.
[9] Fullier R. ``Neural Fuzzy Systems", ISBN: 951-650-624-0, ISSN: 0358-5654.
[10] Liu X., Wang X., Pedrycz W. (2015). ``Fuzzy clustering with semantic interpretation", Applied Soft Computing, 26, 21-30.
[11] Pedraza T., Rodríguez-López J., Romaguera S. (2014). ``Convergence of fuzzy sets with respect to the supremum metric", Fuzzy Sets and Systems, 245, 83-100.
[12] Otadi M. (2014). ``Fully fuzzy polynomial regression with fuzzy neural networks", Neuro computing, 142, 486-493.
[13] Roldán A., Martínez-Morenoa J., Roldán C. (2014). ``Some applications of the study of the image of a fuzzy number: Countable fuzzy numbers, operations, regression and a specificity-type ordering", Fuzzy Sets and Systems, 257, 204-216.
[14] Rosenfeld A. (1975). ``Fuzzy graphs", In L. A. Zadeh, K. S. Fu and M. Shimura, Eds., Fuzzy Sets and Their Applications, Academic press, NewYork.
[15] Susana M., Teresa M., Javier R., Javier Y. (2005). ``Colouring fuzzy graphs", Omega, 33, 211-221.
[16] Sunil M., Sunitha M. S. (2009). ``Types of arcs in a fuzzy graph", Information Sciences, 179, 1760-1768.
[17] Stefanini L. (2010). ``A generalization of Hukuhara difference and division for interval and fuzzy arithmetic", Fuzzy Sets and Systems, 161, 1564-1584.
[18] Yang H. L., Li S. G., Yang W. H., Lu Y. (2013). ``Notes on ‘‘ Bipolar fuzzy graphs’’ ", Information Sciences, 242, 113–121.
[19] Zadeh L. A. (1965). ``Fuzzy sets", Information and Control, 8, 338-353.