@INPROCEEDINGS{STACS2006_Cartesian,
	author    = {Iwona Bialynicka-Birula and Roberto Grossi},
	title     = {Amortized Rigidness in Dynamic {C}artesian Trees},
 	booktitle = {Proceedings of the 23rd Symposium on Theoretical Aspects of Computer Science, STACS 2006},
	editor    = {Bruno Durand and Wolfgang Thomas},
	publisher = {Springer-Verlag},
	series    = {Lecture Notes in Computer Science},
	volume    = {3884},
 	year      = {2006},
 	pages     = {80--91}
}