@article{NSJOM_1991_21_2a_9,
     author = {Cvetkovi\'c Ljiljana},
     title = {Some inequalities for 

 spectral radius in connection with relaxation methods convergence theory},
     journal = {Novi Sad Journal of Mathematics},
     pages = {111-117},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1991},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1991_21_2a_9/}
}