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1. Guido Barone, Giuseppina Castronuovo, Claudio Della Volpe and Vittorio Elia
Nuclear magnetic resonance studies of aqueous solutions of alkylureas: Proton and carbon-13 chemical shifts
Journal of Solution Chemistry
Volume 6, Number 3, 117-127

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http://dx.doi.org/10.1007/BF00646733

2. John Emsley, Naser M. Reza and Reiko Kuroda
Hydrogen bonding of urea-salicylic acid, U·SA
Journal of Chemical Crystallography
Volume 16, Number 1, 57-69

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http://dx.doi.org/10.1007/BF01566046

3. Kimiko Umemoto, Steven S. Danyluk
Nuclear magnetic resonance investigation of molecular motion in urea-d4/n-hydrocarbon and urea-d4/fatty acid adducts
J. Phys. Chem., 1967, 71 (12), pp 3757–3764

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http://dx.doi.org/10.1021/j100871a006

4. E. G. Finer, F. Franks, M. J. Tait
Nuclear magnetic resonance studies of aqueous urea solutions
J. Am. Chem. Soc., 1972, 94 (13), pp 4424–4429

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http://dx.doi.org/10.1021/ja00768a004

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