Travnikoff B (1 April 1983). "Semiquantitative screening test for cocaine". Analytical Chemistry. 55 (4): 795–796. doi:10.1021/ac00255a048. ISSN0003-2700.
Travnikoff B (1 April 1983). "Semiquantitative screening test for cocaine". Analytical Chemistry. 55 (4): 795–796. doi:10.1021/ac00255a048. ISSN0003-2700.