ClaudiaC.OelligClaudiaC., JacobJ.SchunckJacobJ., WolfgangW.SchwackWolfgangW., Determination of caffeine, theobromine and theophylline in Mate beer and Mate soft drinks by high-performance thin-layer chromatography, „Journal of Chromatography. A”, 1533, 2018, s. 208–212, DOI: 10.1016/j.chroma.2017.12.019, PMID: 29241955.
ClaudiaC.OelligClaudiaC., JacobJ.SchunckJacobJ., WolfgangW.SchwackWolfgangW., Determination of caffeine, theobromine and theophylline in Mate beer and Mate soft drinks by high-performance thin-layer chromatography, „Journal of Chromatography. A”, 1533, 2018, s. 208–212, DOI: 10.1016/j.chroma.2017.12.019, PMID: 29241955.