@article{KJM_2010_34_1_a14,
     author = {Kumarappan Kathiresan and R. Sumathi},
     title = {Radial {Digraphs}},
     journal = {Kragujevac Journal of Mathematics},
     pages = {161 - 170},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/KJM_2010_34_1_a14/}
}