@article{ITA_2011__45_3_331_0,
     author = {Cerioli, Marcia R. and Faria, Luerbio and Ferreira, Talita O. and Protti, F\'abio},
     title = {A note on maximum independent sets and minimum clique partitions in unit disk graphs and penny graphs: complexity and approximation},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {331--346},
     publisher = {EDP-Sciences},
     volume = {45},
     number = {3},
     year = {2011},
     doi = {10.1051/ita/2011106},
     mrnumber = {2836493},
     zbl = {1228.05224},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita/2011106/}
}