References
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- Elemental analysis on the unrecrystallized solid was within 0.3% for each element (C,H,N)
- p-Anisidine reacted to form approximately 20% of what was apparently 4,4′-dimethoxydiphenylurea but with a lower purity than the other compounds.
- Naegeli , C. , Tyabji , A. and Courad , L. 1938 . Helv. Chem. Acta , : 1127