@article{NSJOM_2001_31_1a_4,
     author = {D. 

 Ma\v{s}ulovi\'c},
     title = {Equivalence co-relations and co-congruences of co-algebras 33},
     journal = {Novi Sad Journal of Mathematics},
     pages = {33-38},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {2001},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2001_31_1a_4/}
}