PATRAMURTI, CHRISTINE, 		MARTONO, SUDIBYO, 		SUGIYANTO, SUGIYANTO, AND 		NURROCHMAD, ARIEF.
" Optimized Method of High Performance Liquid Chromatography using Octyl Silica Fully Endcapped Residual Silanol Column on Separation of Cotinine and 3-Hydroxycotinine in Urine Sample" <em>JURNAL ILMU KEFARMASIAN INDONESIA</em> [Online], Volume 12 Number 1 (30 April 2014)