Canadell, J.; R. B. Jackson; J. B. Ehleringer; H. A. Mooney; O. E. Sala; E.-D. Schulze (18 July 1996). "Maximum rooting depth of vegetation types at the global scale". Oecologia. 108 (4): 583–595. doi:10.1007/BF00329030. PMID28307789. S2CID2092130.
dwaf.gov.za
www2.dwaf.gov.za
"Protected Trees"(PDF). Department of Water Affairs and Forestry, Republic of South Africa. 3 May 2013. Archived from the original(PDF) on 2010-07-05.
nih.gov
pubmed.ncbi.nlm.nih.gov
Canadell, J.; R. B. Jackson; J. B. Ehleringer; H. A. Mooney; O. E. Sala; E.-D. Schulze (18 July 1996). "Maximum rooting depth of vegetation types at the global scale". Oecologia. 108 (4): 583–595. doi:10.1007/BF00329030. PMID28307789. S2CID2092130.
Canadell, J.; R. B. Jackson; J. B. Ehleringer; H. A. Mooney; O. E. Sala; E.-D. Schulze (18 July 1996). "Maximum rooting depth of vegetation types at the global scale". Oecologia. 108 (4): 583–595. doi:10.1007/BF00329030. PMID28307789. S2CID2092130.
web.archive.org
"Protected Trees"(PDF). Department of Water Affairs and Forestry, Republic of South Africa. 3 May 2013. Archived from the original(PDF) on 2010-07-05.