Tidwell, Thomas T. (). „Hugo (Ugo) Schiff, Schiff Bases, and a Century of β-Lactam Synthesis”. Angewandte Chemie International Edition. 47 (6): 1016–20. doi:10.1002/anie.200702965. PMID18022986.
Tidwell, Thomas T. (). „Hugo (Ugo) Schiff, Schiff Bases, and a Century of β-Lactam Synthesis”. Angewandte Chemie International Edition. 47 (6): 1016–20. doi:10.1002/anie.200702965. PMID18022986.
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