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- [3] DETERMINATION OF SUBSTITUENT EFFECTS BY FACTOR-ANALYSIS AND MULTIPLE LINEAR-REGRESSION FOR THE C-13 NUCLEAR-MAGNETIC-RESONANCE CHEMICAL-SHIFTS IN 4-SUBSTITUTED PHENOLS AND 2-NITROPHENOLS CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE, 1987, 65 (06): : 1316 - 1321