Swertia affinis:
Swertia affinis C. B. Clarke, Gentianaceae: See Swertia angustifolia var. pulchella (D. Don) Burkill.
I have no articles for this botanical term, but there might be some for the next level down (if found).
Henriette's book #2
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.
Affiliate links
Plant Healer Magazine: Very relevant to the practitioner.
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