Composition #4: MOORE, JM., CASALE, JF., KLEIN, RFX., COOPER, DA., LYDON, J. DETERMINATION AND IN-DEPTH CHROMATOGRAPHIC ANALYSES OF ALKALOIDS IN SOUTH-AMERICAN AND GREENHOUSE-CULTIVATED COCA LEAVES. JOURNAL OF CHROMATOGRAPHY A, 1994, vol. 659, no. 1, p. 163–175. DOI: 10.1016/0021-9673(94)85018-6.
[
DOI link]