@article{NSJOM_1985_15_1a_19,
     author = {\v{S}e\v{s}elja 

 Branimir and Vojvodi\'c Gradimir},
     title = {On the permutability of 

 weak fuzzy congruence relations},
     journal = {Novi Sad Journal of Mathematics},
     pages = {217-223},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1985},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1985_15_1a_19/}
}