info:oai:icrisat:9827info:ofi/fmt:xml:xsd:journalZezzaAZezza, AFederighiGFederighi, GKalilouA AKalilou, A AHiernauxPHiernaux, PMilking the data: Measuring milk off-take in extensive livestock systems. Experimental evidence from NigerFood Policy03069192February 201659174-186article