2009 & earlier
- R. Godoy, et al. "Long-term (secular) change of ethnobotanical knowledge of useful plants: Separating cohort and age effects." Journal of Anthropological Research. 65. (2009): 51-67.
- Razavi SM et al. "Measuring poverty indices and income distribution in Iran in 2002" (in Persian), Institute for Management and Planning Studies Publication Center, Tehran-Iran. (2005).