+++2 статьи Science Direct

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Помогите, пожалуйста, с 2 статьями:

1) Multiresidue confirmation of β-agonists in bovine retina and liver using LC-ES/MS/MS
Lee D. Williams, Mona I. Churchwell, Daniel R. Doerge
Journal of Chromatography B, Volume 813, Issues 1–2, 25 December 2004, Pages 35–45

DOI:

http://dx.doi.org/10.1016/j.jchromb.2004.09.005

2) Determination of clenbuterol, ractopamine and zilpaterol in liver and urine by liquid chromatography tandem mass spectrometry
José Blanca, Patricia Muñoz, Miguel Morgado, Nely Méndez, Angela Aranda, Thea Reuvers, Henny Hooghuis
Analytica Chimica Acta, Volume 529, Issues 1–2, 24 January 2005, Pages 199–205

DOI:

http://dx.doi.org/10.1016/j.aca.2004.09.061

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