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- [7] DIRECT DIGITAL CONTROL SYSTEM FOR INDUSTRIAL PROCESSES INDUSTRIAL ELECTRONICS, 1968, 6 (02): : 67 - &
- [8] CONTROL TECHNIQUES .5. DIGITAL CIRCUIT ENGINEERING WERKSTATTSTECHNIK ZEITSCHRIFT FUR INDUSTRIELLE FERTIGUNG, 1978, 68 (12): : 793 - 796
- [9] DIRECT DIGITAL CONTROL IN CHEMICAL-INDUSTRY AUSTRALIAN JOURNAL OF INSTRUMENTATION & CONTROL, 1973, 29 (04): : 107 - 109