@book {4467,
	title = {Flora Xizangica},
	volume = {1},
	year = {1983},
	author = {Ching and S. K. Wu}
}
@article {2543,
	title = {The Studies of Chinese Ferns I},
	journal = {Sinensia},
	volume = {1},
	year = {1930},
	author = {Ching}
}
