@book{179473,
	author = {Padilla Sánchez, José A. and Pontificia Universidad Católica de Puerto Rico. },
	title = {Determination of benzoylmethylecgononine and its metabolites in human hair, using solid-phase extraction and gas chromatography with ion trap mass spectrometry},
	year = {2001.},
	note = {Typescript.}
}