@inbook{93d2e68f55a445469c520dc3463c4b5c,
title = "Where do we stand 20 years after the assessment of soil nutrient balances in sub - Saharan Africa",
keywords = "METIS-294617",
author = "E.M.A. Smaling and J.P. Lesschen and {van Beek}, C.L. and {de Jager}, A. and J.J. Stoorvogel and N.H. Batjes and L.O. Fresco",
year = "2012",
language = "English",
isbn = "978-1-4398-4450-2",
pages = "499--537",
editor = "R. Lal and B.A. Steward",
booktitle = "World soil resources and food security",
publisher = "CRC Press (Taylor & Francis)",
}