@article{NSJOM_2000_30_3a_11,
     author = {P. 

 Mogin and I. Lukovi\'c and M. Govedarica},
     title = {Extended referential integrity},
     journal = {Novi Sad Journal of Mathematics},
     pages = {111-122},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {2000},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2000_30_3a_11/}
}