@article{NSJOM_1991_21_1a_15,
     author = {Hejduk Jacej},
     title = {Convergence with respect 

 to some \ensuremath{\sigma} . ideals},
     journal = {Novi Sad Journal of Mathematics},
     pages = {157-164},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1991},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1991_21_1a_15/}
}