@article{NSJOM_1999_29_2a_1,
     author = {Yu. L. 

 Ershov},
     title = {The 

 injective huli and the 6c-hullof a topological space},
     journal = {Novi Sad Journal of Mathematics},
     pages = {1-6},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1999_29_2a_1/}
}