- Chemistry. 209: 175. doi:10.1007/3-540-48146-X. ISBN 978-3-540-66573-1.
Portsteffen A,
Draeger B,
Nahrstedt A (1992). "Two
tropinone reducing enzymes from...
- 1038/s41467-018-07671-3. ISSN 2041-1723. PMC 6290073. PMID 30538251. A.
Portsteffen, B. Draeger, A.
Nahrstedt (1992). "Two
tropinone reducing enzymes from...
- Funck, Christoph; Höhler, Almut; Mrachatz, Gabriele; Nahrstedt, Adolf;
Portsteffen, Andreas; Schaal, Angela; Schmidt,
Rainer (1994). "Calystegines as a...
- leader) in the 8.(MG)/Infanterie-Regiment 266 25
August 1942 — —
Josef Portsteffen Heer 10-HOberfeldwebel
Shock troops leader in the 1./Pionier-Bataillon...
- 1007/bf00033883. S2CID 21524758.
Boswell HD, Dräger B,
McLauchlan WR,
Portsteffen A,
Robins DJ,
Robins RJ,
Walton NJ (November 1999). "Specificities of...
- 1007/bf00033883. S2CID 21524758.
Boswell HD, Dräger B,
McLauchlan WR,
Portsteffen A,
Robins DJ,
Robins RJ,
Walton NJ (November 1999). "Specificities of...
- (4): 445–448. doi:10.1038/ng1297-445. PMID 9398847. S2CID 34034756.
Portsteffen H,
Beyer A,
Becker E,
Epplen C,
Pawlak A,
Kunau WH, Dodt G (December...
- 241–247. doi:10.1007/bf00033883.
Boswell HD, Dräger B,
McLauchlan WR,
Portsteffen A,
Robins DJ,
Robins RJ,
Walton NJ (November 1999). "Specificities of...