@article{DMGT_2002_22_2_a8,
     author = {Henning, Michael},
     title = {A characterization of roman trees},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {325--334},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2002_22_2_a8/}
}