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2. ^{{cite journal | title = Biosynthesis of pyrrolizidine alkaloids: putrescine and spermidine are essential substrates of enzymatic homospermidine formation | vauthors = Böttcher F, Ober D, Hartmann T |journal = Can. J. Chem. |year = 1994 |volume = 72 |pages = 80–85 |pmid = | doi = 10.1139/v94-013 }}
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5. ^{{cite journal | title = Homospermidine synthase of Rhodopseudomonas viridis: Substrate specificity and effects of the heterologously expressed enzyme on polyamine metabolism of Escherichia coli | vauthors = Ober D, Tholl D, Martin W, Hartmann T |journal = J. Gen. Appl. Microbiol. |year = 1996 |volume = 42 |pages = 411–419 |pmid = | doi = 10.2323/jgam.42.411 | issue = 5 }}
6. ^{{cite journal | vauthors = Ober D, Hartmann T | title = Homospermidine synthase, the first pathway-specific enzyme of pyrrolizidine alkaloid biosynthesis, evolved from deoxyhypusine synthase | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 96 | issue = 26 | pages = 14777–82 | date = December 1999 | pmid = 10611289 | pmc = 24724 | doi = 10.1073/pnas.96.26.14777 | bibcode = 1999PNAS...9614777O }}