@article{weko_13136_1, author = "Ryozo,Nakamura and Ningping,Sun and Takuo,Nakashima", title = "An Approximate Analysis of the AVL Balanced Tree Insertion Algorithm", journal = "情報処理学会論文誌", year = "1998", volume = "39", number = "4", pages = "1006--1013", month = "apr" }