CGAL 4.6.1 - Interval Skip List
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E. N. Hanson. The interval skip list: a data structure for finding all intervals that overlap a point. In Proc. 2nd Workshop Algorithms Data Struct., volume 519 of Lecture Notes Comput. Sci., pages 153–164. Springer-Verlag, 1991.
W. Pugh. Skip lists: a probabilistic alternative to balanced trees. Commun. ACM, 33(6):668–676, 1990.