@article{UBHD-68176815,
  author={El-Shazly, Assem and Tei, Andreas and Wink, Michael},
  title={Pyrrolizidine alkaloids from echium rauwolfii and echium horridum (Boraginaceae)},
  year={1999},
  pages={295-300},
  language={eng},
  issn={1865-7125},
  volume={54},
  journal={Zeitschrift f{\"u}r Naturforschung},
}
@article{UBHD-69105804,
  author={El-Shazly, Assem and El-Domiaty, Maher and Witte, Ludger and Wink, Michael},
  title={Pyrrolizidine alkaloids in members of the Boraginaceae from Sinai (Egypt)},
  year={1998},
  pages={619-636},
  language={eng},
  issn={1873-2925},
  volume={26},
  number={6},
  note={Gesehen am 02.08.2023},
  journal={Biochemical systematics and ecology},
  doi={10.1016/S0305-1978(98)00028-3},
}