On Graphs Having No Chromatic Zeros in (1, 2).

Feng Ming Dong Khee Meng Koh On Graphs Having No Chromatic Zeros in (1, 2). 799-810 2006 20 SIAM J. Discrete Math. 3 http://dx.doi.org/10.1137/04061787X db/journals/siamdm/siamdm20.html#DongK06