O.  Phillips and Gentry, A. H., ?The Useful Plants of Tambopata, Peru: I. Statistical Hypotheses Tests with a New Quantitative?, Economic BotanyEconomic Botany, vol. 47, pp. 15-32, 1993.

O.  Phillips and Gentry, A. H., ?The Useful Plants of Tambopata, Peru: II. Additional Hypothesis Testing in Quantitative Ethnobotany?, Economic BotanyEconomic Botany, vol. 47, pp. 33-43, 1993.