Composition #4: GIRIN, MA., PAPHASSARANG, S., DAVIDETEVE, C., CHABOUD, A., RAYNAUD, J. DETERMINATION OF INGENOL IN HOMEOPATHIC MOTHER TINCTURES OF EUPHORBIA SPECIES BY HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY. JOURNAL OF CHROMATOGRAPHY, 1993, vol. 637, no. 2, p. 206–208. DOI: 10.1016/0021-9673(93)83215-E.
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