Andrade de Oliveira MC (1999) Atlas Escolar de Pernambuco. Espaco, Geo-Historico e Cultural, Recife Google Scholar
Andreae B (1977) Agrargeographie, Strukturzonen und Betriebsformen in der Weltwirtschaft. de Gruyter, Berlin New York Google Scholar
Araujo de JC, Döll P, Güntner A, Krol M, Beghini Rodrigues Abreu C, Hauschild M, Mendiondo EM (2004) Water scarcity under scenarios of global climate change and regional development in semiarid Northeastern Brazil. Water Int 29(2):209–220 Google Scholar
Barbier EB (1990) The farm-level economics of soil conservation: the uplands of Java. Land Econ 66(2):199–211 Article Google Scholar
Barret S (1991) Optimal soil conservation and the reform of agricultural pricing policies. J Devel Econ 36:167–187 Article Google Scholar
Bezerra NF (2002) Água no semi-árido nordestino. Experiências e desafios. In: Hofmeister W (Hrsg.) Água e desenvolvimento sustentável no Semi-Árido. Fortaleza, pp 35–51
Blaikie P, Brookfield H (1987) Land degradation and society. Methuen, London Google Scholar
BNB (2000) Fruticultura Irrigada: Os casos das regiões de Petrolina-Juazeiro e Norte de Minas Gerais. Fortaleza
Brookfield H, Stocking M (1999) Agrodiversity: definition, description and design. Glob Environ Change 9:77–80 Article Google Scholar
Carvalho O, y Egler CAG (2003) Alternativas de desenvolvimento para o Nordeste semi-árido. Fortaleza
CEPRO (2003) O Piauí hoje. Conjuntura econômica. Análise Geral da Economia Piauiense. Fundação Centro de pesquisa econômicas e sociais do Piauí, Teresina Google Scholar
Collins JL (1987) Labor scarcity and ecological change. In: Little PD, Horowitz MM, Nyerges AE (eds) Lands at risk in the third world: local-level perspectives. Westview Press, Boulder, pp 13–29 Google Scholar
CONDEPE (2001) Monografia da Microrregiao do Vale do Ipojuca
Damiani O (1999) Beyond market failures: irrigation, the state and non-traditional agriculture in Northeast Brazil. Environ Manag 59:279–298 Google Scholar
Eisenack K, Petschel-Held G (2002) Graph theoretical analysis of qualitative models in sustainability science. In: Working papers of 16th international workshop on qualitative reasoning, pp 53–60. http://www.upc.es/web/QR2002/Principal.htm
Elias D (2002) O Novo Espaço da Produção Globalizada. O Baixo Jaguaribe. Fortaleza
Eswaran H, Reich P, Beinroth F (1999) Global desertification Tension Zones. In: USDA (ed) Sustaining the global farm. Selected papers from the 10th international soil conservation organization meeting, pp 24–28
Gerstengarbe FW, Werner PC (2003) Climate analysis and scenarios for Northeast Brazil. In: Gaiser T, Krol M, Frischkorn H, Araujo JC de (eds) Global change and regional impacts. Water availability and vulnerability of ecosystems and society in the semiarid northeast of Brazil. Springer, Berlin Heidelberg New York, pp 137–151 Google Scholar
Gomes GM (2001) Velhas Secas em Novos Sertoes. Brasilia
Grepperud S (1997) Poverty, land degradation and climatic uncertainty. Oxford Econ Pap 49:586–608 Google Scholar
Häussler B (1996) Anspruch und Wirklichkeit der Basisbewegungen im Nordosten Brasiliens - Fallstudie der Cooperative COOMAP. Thesis, University of Hohenheim, Stuttgart
Heidemann D (1981) Arbeitsteilung und regionale Mobilität an der Peripherie des Weltmarktes. Zur Binnenwanderung in Nordostbrasilien. Brasilienkunde-Verlag, Mettingen Google Scholar
Holden S, Shiferaw B (2004) Land degradation, drought and food security in a less-favoured area in the Ethiopian highlands: a bio-economic model with market imperfections. Agr Econ 30(1):31–49 Article Google Scholar
Instituto Desert (2003) Programma de Combate a Desertificacao em Pernambuco. Informe Final. Terezina
Jones BD (1999) Bounded rationality. Annu Rev Polit Sci 2:297–312 Article Google Scholar
Kohlhepp G (1994) Sozialräumliche Gliederung und Regionalstruktur. In: Briesemeister D, Kohlhepp G, Mertin RG, Sangmeister H, Schrader A (eds) Brasilien heute. Politik - Wirtschaft - Kultur. Bibliotheca Ibero-Americana 53, Frankfurt, pp 70–94
Kuipers B (1994) Qualitative reasoning. Modeling and simulation with incomplete knowledge. MIT Press, Cambridge Google Scholar
Lemos JS (2001) Niveis de degradacao no Nordeste Brasileiro. Rev Econ Nordeste 32(3):406–429 Google Scholar
Lüdeke MKB, Petschel-Held G, Schellnhuber HJ (2004) Syndromes of global change. A first panoramic view. GAIA 13:42–49 Google Scholar
Mertins G (1982) Determinanten, Umfang und Formen der Migration Nordostbrasiliens. Geogr Rdsch 34:352–358 Google Scholar
Mertins G (1997) Agrarstrukturelle Probleme, staatliche Entwicklungsprogramme und Abwanderung im ländlichen Raum Nordostbrasiliens. Arbeitshefte des Lateinamerika-Zentrums 40, Münster
Mutter T (1991) Fehlt es nur an Wasser? Zur Agrarpolitik im Sertão, Nordost-Brasilien. Nord-Süd Aktuell 3:365–375 Google Scholar
Olimpio JA (2000) A industria ceramica na regiao polarizada por Teresina-Piaui. Carta CEPRO 19(2):85–96 Google Scholar
Petschel-Held G, Lüdeke MKB (2001) Integration of case studies on global change by means of qualitative differential equations. Integr Ass 2(3):123–138 Article Google Scholar
Petschel-Held G, Block A, Cassel-Gintz M, Lüdeke MKB, Kropp J, Moldenhauer O, Reusswig F, Schellnhuber HJ (1999) Syndromes of global change: a qualitative modelling approach to assist global environmental management. Environ Model Assess 4:295–314 Article Google Scholar
Pimentel D, Harvey C, Resosudarmo P, Sinclair K, Kurz D, McNair M, Crist S, Shpritz L, Fitton L, Saffouri R, Blair R (1995) Environmental and economic costs of soil erosion and conservation benefits. Science 267:1117–1123 ArticleCAS Google Scholar
Rheker JR (1989) Untersuchungen zum Rückgang der kleinbäuerlichen Grundnahrungsmittelproduktion in ausgewählten Munizipien des nordostbrasilianischen Agreste. Erdkunde 43:119–132 Article Google Scholar
Rönick, V. (1986) Regionale Entwicklungspolitik und Massenarmut im ländlichen Raum Nordost-Brasiliens. Ursachen des Elends und Hindernisse bei der Erfüllung der Grundbedürfnisse. Münstersche Geographische Arbeiten 25
Schellnhuber HJ, Block A, Cassel-Gintz M, Lammel J, Lass W, Lienenkamp R, Loose C, Lüdeke MKB, Moldenhauer O, Petschel-Held G, Plöchl M, Reusswig F (1997) Syndromes of global change. GAIA 6(1):19–34 Google Scholar
Schellnhuber HJ, Lüdeke MKB, Petschel-Held G (2002) The syndromes approach to scaling-describing global change on an intermediate functional scale. Integr Ass 3(2–3):201–219 Article Google Scholar
Schwalbach M (1993) Autokratismus und Wirtschaftspolitik in Brasilien (1964–1985) Zur politischen Ökonomie der wirtschaftlichen Entwicklung der Nordostregion. Frankfurt Google Scholar
da Silva JB (2002)Atlas Escolar de Ceara. Espaco, Geo-Historico e Cultural. Fortaleza
Stave KA (2002) Using systems dynamics to improve public participation in environmental decisions. Syst Dyn Rev 18(2):139–167 Article Google Scholar
Thaler RH (2000) From homo economicus to homo sapiens. J Econ Perspect 14(1):133–141 Article Google Scholar
Turner B II, Kasperson R, Meyer WB, Dow K, Golding D, Kasperson JX, Mitchell RC, Ratick SJ (1990) Two types of global environmental change: definitional and spatial scale issues in their human dimension. Glob Environ Change 1:14–22 Article Google Scholar
Varian HR (1984) Microeconomic analysis, 2nd edn. WW Norton, New York Google Scholar
Voerkelius S, Külls C, Santiago MMF, Frischkorn H, Alves dos Santos Semrau L, Heinrichs, López Gil MM (2003) Investigation on water management and water quality in Picos/PI and Tauá/CE. In: Gaiser T, Krol M, Frischkorn H, de Araujo JC (eds) Global change and regional impacts. Water availability and vulnerability of ecosystems and society in the semiarid Northeast of Brazil. Springer, Berlin Heidelberg New York, pp 173–184
Voth A (2002) Innovative Entwicklungen in der Erzeugung und Vermarktung von Sonderkulturprodukten. Vechtaer Studien zur Angewandten Geographie und Regionalwissenschaft 24, Vechta
Wilbanks T, Kates K (1999) Global change in local places: how scale matters. Clim Change 43:601–628 Article Google Scholar