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 | 1996 | |
|---|---|---|
| 1 |      | L. J. Campbell, Terry A. Halpin, Henderik Alex Proper: Conceptual Schemas with Abstractions: Making Flat Conceptual Schemas More Comprehensible. Data Knowl. Eng. 20(1): 39-85 (1996) |
| 1 | Terry A. Halpin | [1] |
| 2 | Henderik Alex Proper (Erik Proper) | [1] |