1. J.L. Bentley, Multidimensional binary search tress used for for associative searching, to appear in Commun. ACM.
2. Partial-match queries and file design;Burkhard;Proc. Conf. Very Large Data Bases,1975
3. W.A. Burkhard, Hashing and trie algorithms for partial-match retrieval, submitted to Commun. ACM.
4. Partial-match retrieval: performance bounds;Burkhard;UCSD Computer Science Division TR,1975
5. NP-completeness of tree structured index minimization;Comer,1975