Mämmelä, Pirjo; Savolainen, Heikki; Lindroos, Lasse; Kangas, Juhani; Vartiainen, Terttu (2000). «Analysis of oak tannins by liquid chromatography-electrospray ionisation mass spectrometry». Journal of Chromatography A891 (1): 75-83. PMID10999626. doi:10.1016/S0021-9673(00)00624-5.
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Mämmelä, Pirjo; Savolainen, Heikki; Lindroos, Lasse; Kangas, Juhani; Vartiainen, Terttu (2000). «Analysis of oak tannins by liquid chromatography-electrospray ionisation mass spectrometry». Journal of Chromatography A891 (1): 75-83. PMID10999626. doi:10.1016/S0021-9673(00)00624-5.