Vulnerability and resilience in livestock systems in the drylands of Sub-Saharan Africa - de Haan, Cornelis; Cervigni, Raffaello; Mottet, Anne; Conchedda, Giulia; Gerber, Pierre; Msangi, Siwa; Lesnoff, Matthieu; Ham, Frederic; Fillol, Erwan; Nigussie, Kidus (World Bank, 2016)