Phenylethylamines from Browningia candelaris – PMA Found in Cactus- 2012
New mescaline concentrations from 14 taxa/cultivars of Echinopsis spp – 2010
Shamanism and San Pedro through Time – 2010
Ethnoarchaeological evidence for San Pedro use in northern Peru – 2001
A Phytochemical Study of Opuntia Ficus Indica (L.) Mill Cultivated in Egypt – 1982
Reunion of the Genus Echinopsis; A preface to the nomenclatural revisions – 1974