Inter- and intra-annual variation of water footprint of crops and blue water scarcity in the Yellow River basin (1961–2009)

La Zhuoa,∗ , Mesfin M. Mekonnena , Arjen Y. Hoekstraa , Yoshihide Wada, La Zhuoa,∗ , Mesfin M. Mekonnena , Arjen Y. Hoekstraa , Yoshihide Wada, 2015