WITTERS, E., VANHOUTTE, K., DEWITTE, W., MACHÁČKOVÁ, I., BENKOVÁ, E., DONGEN, V. A., ESMAS, E. L., ONCKELEN, v. H. A. Analysis of cyclic nucleotides and cytokinins in minute plant samples using phase-systen switching capillary electrospray-liquid chromatography-tandem mass spectrometry. Phytochemical Analysis. 1999, 10(-), 143-151. ISSN 0958-0344. E-ISSN 1099-1565.