Edder, Patrick, Werner Haerdi, Jean-luc Veuthey, and Christian Staub. “Quantitative Capillary Supercritical Fluid Chromatography and Supercritical Fluid Extraction of Basic Drugs of Abuse”. CHIMIA 46, no. 4 (April 29, 1992): 141. Accessed April 9, 2025. https://www.chimia.ch/chimia/article/view/1992_141.