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James D. Batchelor, Everett E. Carpenter, Grant N. Holder, Cassandra T. Eagle, Jon Fielder, Jared Cummings, Recreation of Wöhler’s Synthesis of Urea: An Undergraduate Organic Laboratory Exercise The Chemical Educator 1/Vol .3, NO.6 1998 ISSN 1430-4171 wersja on-line