James W. Mehl, C. P. Wang. A Study of Order Transformations of Hierarchical Structures in IMS Data Base. In Randall Rustin, editor, Proceedings of 1974 ACM-SIGMOD Workshop on Data Description, Access and Control, Ann Arbor, Michigan, May 1-3, 1974, 2 Volumes. pages 125-139, ACM, 1974. [doi]
Abstract is missing.