@article{KJM_2003_25_1_a2,
     author = {Kinkar Ch. Das},
     title = {Sharp bounds for the sum of the squares of the degrees of a graph},
     journal = {Kragujevac Journal of Mathematics},
     pages = {31 - 49},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {2003},
     zbl = {1051.05034},
     url = {http://geodesic.mathdoc.fr/item/KJM_2003_25_1_a2/}
}