@article{EXMA_2006__15_3_223876,
     author = {Lundow, P.H. and Markstr\"om, K.},
     title = {Broken-cycle-free subgraphs and the log-concavity conjecture for chromatic polynomials.},
     journal = {Experimental mathematics},
     pages = {343--353},
     year = {2006},
     volume = {15},
     number = {3},
     zbl = {1120.05032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_2006__15_3_223876/}
}