@book {4467,
	title = {Flora Xizangica},
	volume = {1},
	year = {1983},
	author = {Ching and S. K. Wu}
}
@book {4466,
	title = {Flora Tsinlingensis},
	volume = {2},
	year = {1974},
	author = {Ching et Hsu}
}
