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K. G. Clark; V. L. Gaddy; C. E. Rist (October 1933). "Equilibria in the Ammonium Carbamate-Urea-Water System". Industrial and engineering chemistry. 25 (10): 1092–1096. doi:10.1021/IE50286A008. ISSN0019-7866. WikidataQ59410838.
Francesco Barzagli; Fabrizio Mani; Maurizio Peruzzini (2011). "From greenhouse gas to feedstock: formation of ammonium carbamate from CO2 and NH3 in organic solvents and its catalytic conversion into urea under mild conditions". Green Chemistry. 13 (5): 1267–1274. doi:10.1039/C0GC00674B. ISSN1463-9262. WikidataQ59410840.
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K. G. Clark; V. L. Gaddy; C. E. Rist (October 1933). "Equilibria in the Ammonium Carbamate-Urea-Water System". Industrial and engineering chemistry. 25 (10): 1092–1096. doi:10.1021/IE50286A008. ISSN0019-7866. WikidataQ59410838.
Francesco Barzagli; Fabrizio Mani; Maurizio Peruzzini (2011). "From greenhouse gas to feedstock: formation of ammonium carbamate from CO2 and NH3 in organic solvents and its catalytic conversion into urea under mild conditions". Green Chemistry. 13 (5): 1267–1274. doi:10.1039/C0GC00674B. ISSN1463-9262. WikidataQ59410840.