@article {van_tieghem1906,
	title = {Sur les Heliotropiac{\'e}es},
	journal = {Annales des sciences naturelles. Botanique},
	volume = {9},
	number = {4},
	year = {1906},
	pages = {261{\textendash}271},
	url = {http://bibdigital.rjb.csic.es/spa/Libro.php?Libro=2490\&Pagina=265},
	author = {van Tieghem, P.}
}
