1. Chromosome studies on ferns;BRITTON;Am. J. Bot.,1953
2. Chromosome numbers of ferns in Ontario;BRITTON;Can. J. Bot.,1964
3. On natural classification of the family Polypodiaceae;CHING;Sunyatsenia,1940
4. A re-classification of the family Thelypteridaceae;CHING;Acta phylotax. sin.,1963
5. 1920. Monograph of the genus Dryopteris, I, II;CHRISTENSEN;K. danske Vidensk. Selsk. Skr.,1913