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- [4] The aachen region: Development through information and communication AUTOMATED SYSTEMS BASED ON HUMAN SKILL 2000: JOINT DESIGN OF TECHNOLOGY AND ORGANISATION, 2000, : 1 - 4
- [7] RESEARCH AS AN ECONOMIC FACTOR - INITIATIVES IN THE REGION OF AACHEN, FRG REGIONAL DEVELOPMENT IN EUROPE : RECENT INITIATIVES AND EXPERIENCES, 1989, : 353 - 359
- [8] Meeting of the Historical Committee of the Steel Institute VDEh in Aachen. Steel and science: The Aachen region Stahl und Eisen, 2016, 136 (11): : 235 - 238
- [9] Vegetation in Aachen and its position in the northern region of West Germany PETERMANNS MITTEILUNGEN, 1935, 81 (9-10): : 387 - 387