Erdös, P. L., M. A. Steel, L. A. Székely, and T. J. Warnow. 2012. “Local Quartet Splits of a Binary Tree Infer All Quartet Splits Via One Dyadic Inference Rule”. Computing and Informatics 16 (2):217-27. http://147.213.75.17/ojs/index.php/cai/article/view/669.