Sustainable livestock management in the Kalahari : an optimal livestock rangeland model (OLR) /
Duraiappah, Anantha K.
International Institute for Environment and Development.
Vrije Universiteit te Amsterdam.Instituut voor Milieuvraagstukken
Collaborative Research in the Economics of Environment and Development.
London : International Institute for Environment and Development ; Amsterdam : Institute for Environmental Studies,
1999.