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Timo Niemi A seven-tuple representation for hierarchical data structures. [Citation Graph (0, 0)][DBLP] Inf. Syst., 1983, v:8, n:3, pp:151-157 [Journal]
Timo Niemi An approach and its specification to data reformatting in data conversion. [Citation Graph (0, 0)][DBLP] Inf. Syst., 1988, v:13, n:1, pp:31-51 [Journal]
Timo Niemi, Kalervo Järvelin Operation-oriented query language approach for recursive queries - Part 1. Functional definition. [Citation Graph (0, 0)][DBLP] Inf. Syst., 1992, v:17, n:1, pp:49-75 [Journal]
Timo Niemi, Kalervo Järvelin Operation-oriented query language approach for recursive queries - Part 2. Prototype implementation and its integration with relational databases. [Citation Graph (0, 0)][DBLP] Inf. Syst., 1992, v:17, n:1, pp:77-106 [Journal]