info:oai:icrisat:1659info:ofi/fmt:xml:xsd:journalHaglundEHaglund, ENdjeungaJNdjeunga, JSnookLSnook, LPasternakDPasternak, DDry land tree management for improved household livelihoods: Farmer managed natural regeneration in NigerJournal of Enviroment Management0301-47972011921696-17057article