@article{RO_2008__42_4_485_0,
     author = {Koster, Arie M. C. A. and Wagler, Annegret K.},
     title = {Comparing imperfection ratio and imperfection index for graph classes},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {485--500},
     publisher = {EDP-Sciences},
     volume = {42},
     number = {4},
     year = {2008},
     doi = {10.1051/ro:2008030},
     mrnumber = {2469108},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ro:2008030/}
}