@article{CMJ_2005__55_1_a1,
     author = {Acharya, Mukti and Singh, Tarkeshwar},
     title = {Graceful signed graphs: {II.} {The} case of signed cycles with connected negative sections},
     journal = {Czechoslovak Mathematical Journal},
     pages = {25--40},
     publisher = {mathdoc},
     volume = {55},
     number = {1},
     year = {2005},
     mrnumber = {2121654},
     zbl = {1081.05097},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2005__55_1_a1/}
}