| 1 | Francis Pilkington. A Pavin For The Lute And Bass Viol. | |
| 2 | A further study of the genus Viola in Hebei Province. | |
| 3 | A preliminary study of the genus Viola in Hebei Province and Beijing region. | |
| 4 | A quantitative analysis of the variation pattern of characters of the Viola variegata complex. | |
| 5 | A preliminary study of the genus Viola in Hebei Province and Beijing region. |
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