Selective on-line trace enrichment for the determination of ethynyl steroids in urine by liquid chromatography with precolumn technology.

MLA

Nielen, M. W., et al. “Selective On-Line Trace Enrichment for the Determination of Ethynyl Steroids in Urine by Liquid Chromatography with Precolumn Technology.” Journal of Chromatography, vol. 417, no. 1, June 1987, pp. 159–67. EBSCOhost, https://doi.org/10.1016/0378-4347(87)80102-0.

APA

Nielen, M. W., van Soest, R. E., van Ingen, H. E., Farjam, A., Frei, R. W., & Brinkman, U. A. (1987). Selective on-line trace enrichment for the determination of ethynyl steroids in urine by liquid chromatography with precolumn technology. Journal of Chromatography, 417(1), 159–167. https://doi.org/10.1016/0378-4347(87)80102-0

Chicago

Nielen, M W, R E van Soest, H E van Ingen, A Farjam, R W Frei, and U A Brinkman. 1987. “Selective On-Line Trace Enrichment for the Determination of Ethynyl Steroids in Urine by Liquid Chromatography with Precolumn Technology.” Journal of Chromatography 417 (1): 159–67. doi:10.1016/0378-4347(87)80102-0.