@Article{LevedeWe09,
author = {Benjamin L\'ev\^eque and Dominique de Werra },
title = {Graph transformations preserving the stability number},
journal = {Electronic Notes in Discrete Mathematics},
volume = {35},
number = {1},
pages = {3-8},
doi = {10.1016/j.endm.2009.11.002 },
year = {2009}
}