Composition #1: Rubiolo, Patrizia., Casetta, Cristina., Cagliero, Cecilia., Brevard, Hugues., Sgorbini, Barbara., Bicchi, Carlo. Populus nigra L. bud absolute: a case study for a strategy of analysis of natural complex substances . analytical and bioanalytical chemistry, 2013, vol. 405, no. 4, p. 1223–1235. DOI: 10.1007/s00216-012-6537-y.
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