@article{NSJOM_1992_22_1a_10,
     author = {Romano Daniel Avra\'am},
     title = {Some theorems about 

 constructions of a-coideals on the cartesian product of sets},
     journal = {Novi Sad Journal of Mathematics},
     pages = {111-118},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1992},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1992_22_1a_10/}
}