@article{CMJ_2004__54_2_a2,
     author = {Acharya, Mukti and Singh, Tarkeshwar},
     title = {Graceful signed graphs},
     journal = {Czechoslovak Mathematical Journal},
     pages = {291--302},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {2004},
     mrnumber = {2059251},
     zbl = {1080.05529},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2004__54_2_a2/}
}