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P. Dobbin | R. Hider | S. Rizvi | D. Helm | K. L. Maki
[1] P. Dobbin,et al. Study of hydrogen bonding in 1-ethyl-2-methyl-4-oxo-1,4-dihydro-pyridin-3-yloxyethanoic acid and 3-(1,2-diethyl-4-oxo-1,4-dihydropyridin-3-yloxy)propanoic acid by 1H NMR spectroscopy and X-ray crystallography , 1993 .