1. Linear Lists and Priority Queues as Balanced Binary Trees;Crane,1972
2. A note on some tree similarity measures;Culik;Inform. Process. Lett.,1982
3. Data Structures and Algorithms 1: Sorting and Searching;Mehlhorn,1984
4. Rotation distance, triangulations, and hyperbolic geometry;Sleator;Proc. 18th Ann. ACM Conf. on Theory of Computing,1986