@article{NSJOM_2001_31_1a_2,
     author = {K. 

 Baliriska and S. Simi\'c},
     title = {Some 

 remarks on integral graphs with maximum degree four},
     journal = {Novi Sad Journal of Mathematics},
     pages = {19-25},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {2001},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2001_31_1a_2/}
}