@article{BUMI_2007_8_10B_2_a12,
     author = {Bonanzinga, Maddalena and Cammaroto, Filippo and Pansera, Bruno A.},
     title = {On {Relative} $\gamma_k${-Sets}},
     journal = {Bollettino della Unione matematica italiana},
     pages = {445--454},
     publisher = {mathdoc},
     volume = {Ser. 8, 10B},
     number = {2},
     year = {2007},
     zbl = {1139.54017},
     mrnumber = {2339453},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2007_8_10B_2_a12/}
}