info:oai:icrisat:5346info:ofi/fmt:xml:xsd:bookLongT DLong, T DRamakrishnaARamakrishna, ATamH MTam, H MVietN VViet, N VChinhN TChinh, N T2001Efficient Management of Natural Resources: A Way to Sustain Food Security in the Rainfed Sloping Lands of Northern Vietnamproceeding