@book {blanco1837,
	title = {Flora de Filipinas},
	year = {1837},
	publisher = {Imprenta de Sto. Tom{\'a}s},
	organization = {Imprenta de Sto. Tom{\'a}s},
	address = {Manila},
	url = {http://bibdigital.rjb.csic.es/spa/Libro.php?Libro=36},
	author = {Blanco, F. M.}
}
@article {nuttall1837,
	title = {Collections towards a flora of the territory of Arkansas},
	journal = {Transactions of the American Philosophical Society: held at Philadelphia for promoting useful knowledge, new series},
	volume = {5},
	year = {1837},
	pages = {139{\textendash}203},
	url = {http://books.google.de/books?pg=PA139\&id=93dFAAAAcAAJ},
	author = {Nuttall, T.}
}
