[[1] EKLUND, P.-GALÁN, M. A.-MEDINA, J.-OJEDA-ACIEGO, M.-VALVERDE, A.: Powerset of terms and composite monads, Fuzzy Sets Syst. 158 (2007), 2552-2574.10.1016/j.fss.2007.06.002]Search in Google Scholar
[[2] EKLUND, P.-GALÁN, M. A.-MEDINA, J.-OJEDA-ACIEGO, M.-VALVERDE, A.: Similarities between powersets of terms, Fuzzy Sets Syst. 144 (2004), 213-225.10.1016/j.fss.2003.10.021]Search in Google Scholar
[[3] HÖHLE, U.: Many Valued Topology and its Applications. Kluwer Acad. Publ., Dordrecht, 2001.10.1007/978-1-4615-1617-0]Search in Google Scholar
[[4] HÖHLE, U.: Fuzzy sets and sheaves. Part I, Basic concepts, Fuzzy Sets Syst. 158 (2007), 1143-1174.10.1016/j.fss.2006.12.009]Search in Google Scholar
[[5] HERRLICH, H.-STRECKER, C. G.: Category Theory, in: Sigma Ser. Pure Math. Vol. 1, Heldermann, Berlin, 1979.]Search in Google Scholar
[[6] DE MITRI, C.-GUIDO, C.: Some remarks on fuzzy powerset operators, Fuzzy Sets Syst. 126 (2002), 241-251.10.1016/S0165-0114(01)00024-0]Search in Google Scholar
[[7] ROSENTHAL, K. I.: Quantales and Their Applications, in: Pitman Res. Notes Math. Ser., Vol. 234, Longman, Burnt Mill, Harlow, 1990.]Search in Google Scholar
[[8] MOČKOŘ, J.: Morphisms in categories of sets with similarity relations, in: Proc. of IFSA Congress/EUSFLAT Conference (J. P. Carvalho et all., eds.), Lisabon, Portugal, 2009, pp. 560-568.]Search in Google Scholar
[[9] MOČKOŘ, J.: Cut systems in sets with similarity relations, Fuzzy Sets Syst. 161 (2010), 3127-3140.10.1016/j.fss.2010.07.009]Search in Google Scholar
[[10] MOČKOŘ, J.: Fuzzy sets and cut systems in a category of sets with similarity relations, Soft Comput. 16 (2012), 101-107.10.1007/s00500-011-0737-9]Search in Google Scholar
[[11] MOČKOŘ, J.: Extension principle for closure operators on fuzzy sets and cuts, Fuzzy Sets Syst. (to appear).]Search in Google Scholar
[[12] MOČKOŘ, J.: Powerset Operators of Fuzzy Objects, (to appear).]Search in Google Scholar
[[13] PREUSS, G.: Foundations of Topology: An Approach to Convenient Topology. Kluwer Acad. Publ., Dordrecht, 2002.10.1007/978-94-010-0489-3]Search in Google Scholar
[[14] RODABAUGH, S. E.: Powerset operator foundation for poslat fuzzy sst theories and topologies, in : Mathematics of Fuzzy Sets: Logic, Topology and Measure Theory (U. Höhle et all., eds.), The Hnadbook of Fuzzy Sets Series, Vol. 3, Kluwer Acad. Publ., Dordrecht, 1999, pp. 91-116.10.1007/978-1-4615-5079-2_3]Search in Google Scholar
[[15] RODABAUGH, S. E.: Powerset operator based foundation for point-set lattice theoretic (poslat) fuzzy set theories and topologies, Quaest. Math. 20 (1997), 463-530.10.1080/16073606.1997.9632018]Search in Google Scholar
[[16] RODABAUGH, S. E.: Relationship of algebraic theories to powerset theories and fuzzy topological theories for lattice-valued mathematics, Int. J. Math. Math. Sci. 2007 (2007), 1-71.10.1155/2007/43645]Search in Google Scholar
[[17] RODABAUGH, S. E.: Relationship of algebraic theories to powersets over objects in Set and SetxC, Fuzzy Sets Syst. 161 (2010), 453-470.10.1016/j.fss.2009.09.010]Search in Google Scholar
[[18] SOLOVYOV, S. A.: Powerset oeprator foundations for catalg fuzzy set theories, Iran. J. Fuzzy Syst. 8 (2001), 1-46.]Search in Google Scholar
[[19] MANES, E. G.: Algebraic Theories. Springer-Verlag, Berlin, 1976.10.1007/978-1-4612-9860-1]Search in Google Scholar
[[20] MANES, E. G.: A class of fuzzy theories, J. Math. Anal. Appl. 85 (1982), 409-451.10.1016/0022-247X(82)90010-5]Search in Google Scholar
[[21] NOVÁK, V.-PERFILIJEVA, I.-MOČKOŘ, J.: Mathematical Principles of Fuzzy Logic. Kluwer Acad. Publ., Dordrecht, 1999.10.1007/978-1-4615-5217-8]Search in Google Scholar
[[22] GERLA, G.-SCARPATI, L.: Extension principles for fuzzy set theory, J. Infor. Sci. 106 (1998), 49-69.10.1016/S0020-0255(97)10003-2]Search in Google Scholar
[[23] NGUYEN, H. T.: A note on the extension principle for fuzzy sets, J. Math. Anal. Appl. 64 (1978), 369-380.10.1016/0022-247X(78)90045-8]Search in Google Scholar
[[24] HE, Q.-LI, H.-CHEN, C. L. P.-LEE, E. S.: Extension principles and fuzzy set categories, Comput. Math. Appl. 39 (2000), 45-53.10.1016/S0898-1221(99)00312-0]Search in Google Scholar
[[25] YAGER, R. R.: A characterization of the extension principle, Fuzzy Sets Syst. 18 (1996), 205-217.10.1016/0165-0114(86)90002-3]Search in Google Scholar
[[26] ZENG, W.-ZHAO, Y.-LI, H.: Extension principle of interval-valued fuzzy set, in: Proc. of the 2nd Internat. Conf. of Fuzzy Inform. and Eng.-ICFIE ’07 (Cao, Bing-Yuan, ed.), Guangzhou, China, 2007, Adv. Soft Comput. 40 (2007), Springer, Berlin, 2007, pp. 125-137.]Search in Google Scholar
[[27] WYLER, O.: Fuzzy logic and categories of fuzzy sets, in: Non-Classical Logics and Their Applications to Fuzzy Subsets, Theory Decis. Libr., Ser. B. Vol. 32, Kluwer Acad. Publ. Dordrecht, 1995, pp. 235-268.10.1007/978-94-011-0215-5_10]Search in Google Scholar
[[28] ZADEH, L. A.: Fuzzy sets, Inform. Control 8 (1965), 338-353.10.1016/S0019-9958(65)90241-X]Search in Google Scholar
[[29] ZHAI, JIAN-YIN: General extension principle, Fuzzy Syst. Math. 9 (1995). ]Search in Google Scholar