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Matzke, K.-H., Meyer, G.-J., Osterholz, A., Coates, G., & Firnau, G. (1991). Synthesis of 11C-labeled 5-hydroxytryptamine for the measurement of pulmonary endothelial cell function. International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 42(4), 401–404. doi:10.1016/0883-2889(91)90145-q 
10.1016/0883-2889(91)90145-q