Recognizing Powers of Proper Interval, Split, and Chordal Graph.

Lap Chi Lau Derek G. Corneil Recognizing Powers of Proper Interval, Split, and Chordal Graph. 83-102 2004 18 SIAM J. Discrete Math. 1 http://dx.doi.org/10.1137/S0895480103425930 db/journals/siamdm/siamdm18.html#LauC04