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- [42] BASIC PRINCIPLES OF INNOVATION PROCESS IN CAPITAL GOODS INDUSTRY WERKSTATTSTECHNIK ZEITSCHRIFT FUR INDUSTRIELLE FERTIGUNG, 1975, 65 (01): : 37 - 41
- [46] THE ENGINEER AND INDUSTRY PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1949, 37 (12): : 1456 - 1458