@article{NSJOM_1988_18_2a_8,
     author = {Achache Achille and Sangalli Arturo A. L.},
     title = {L'endofoncteur "extension" associ\'e \`a un 

 espace de fermeture},
     journal = {Novi Sad Journal of Mathematics},
     pages = {111-116},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1988},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1988_18_2a_8/}
}