Beaudou, L., Bondy, A., Chen, X., Chiniforooshan, E., Chudnovsky, M., Chvátal, V., Fraiman, N. and Zwols, Y. (2015) “A De Bruijn–Erdős Theorem for Chordal Graphs”, The Electronic Journal of Combinatorics, 22(1), p. P1.70. doi: 10.37236/3527.