TY - JOUR T1 - Skip lists: a probabilistic alternative to balanced trees JF - Communications of the ACMCommun. ACM Y1 - 1990 A1 - Pugh, William VL - 33 SN - 00010782 UR - http://dl.acm.org/citation.cfm?id=78977, CP - 6 M3 - 10.1145/78973.78977 ER -