1. Acheampong M, Ertemb FC, Kapplerc B, Neubauerb P (2017) In pursuit of sustainable development goal (SDG) number 7: will biofuels be reliable? Renew Sust Energ Rev 75:927–937
2. Angelsen A, Jagger P, Babigumira R, Belcher B, Hogarth N, Bauch S, Borner J, Smith-Hall C, Wunder S (2004) Environmental income and rural livelihoods: a global-comparative analysis. World Dev 64:12–28. http://www.sciencedirect.com/science/article/pii/S0305750X14000722
3. Bruce N, Perez-Padilla R, Albalak R (2000) Indoor air pollution in developing countries: a major environmental and public health challenge. Bull World Health Organ 78(9):1078–1092
4. Belaunde E, Rivas C (1993) Responding to practice and affecting policy: The experience of the Madeleña Project in Central America. In: Selected Papers from the Scientific Week held at Turrialba. CATIE, Turrialba, Costa Rica, pp 66–70. https://books.google.com/books?id=ytEOAQAAIAAJ&pg=PA69&lpg=PA69&dq=madelena+project+at+catie&source=bl&ots=BKhkufOEPx&sig=Kw04yqbnGT4N9ZDSM28DT8s2dfg&hl=en&sa=X&ved=0ahUKEwiay-fdocXUAhXBRyYKHfwJBJkQ6AEIHjAB#v=onepage&q=madelena%20project%20at%20catie&f=false
5. CATIE (Centro Agronómico Tropical de Investigación y Enseñanza) (1986) Silvicultura de especies promisorias para la producción de leña en América Central; resultados de cinco años de investigación. In: Centro Agronómico Tropical de Investigación y Enseñanza, Serie Técnica, Informe Técnico, vol No. 86, Turrialba, Costa Rica