L. Sunil Chandran Louis Ibarra Frank Ruskey Joe Sawada Generating and characterizing the perfect elimination orderings of a chordal graph. 303-317 2003 307 Theor. Comput. Sci. 2 http://dx.doi.org/10.1016/S0304-3975(03)00221-4 db/journals/tcs/tcs307.html#ChandranIRS03