Carbon, B.A. (1982). "Deep drainage and water use of forests and pastures grown on deep sands in a Mediterranean environment" [Journal of Hydrology]. Journal of Hydrology. 55 (1): 53–63. Bibcode:1982JHyd...55...53C. doi:10.1016/0022-1694(82)90120-2.
Schoonees, A; Visser, J; Musekiwa, A; Volmink, J (2012). "Pycnogenol (extract of French maritime pine bark) for the treatment of chronic disorders". Cochrane Database of Systematic Reviews (7): CD008294. doi:10.1002/14651858.CD008294.pub4. PMID22513958.
Carbon, B.A. (1982). "Deep drainage and water use of forests and pastures grown on deep sands in a Mediterranean environment" [Journal of Hydrology]. Journal of Hydrology. 55 (1): 53–63. Bibcode:1982JHyd...55...53C. doi:10.1016/0022-1694(82)90120-2.
Schoonees, A; Visser, J; Musekiwa, A; Volmink, J (2012). "Pycnogenol (extract of French maritime pine bark) for the treatment of chronic disorders". Cochrane Database of Systematic Reviews (7): CD008294. doi:10.1002/14651858.CD008294.pub4. PMID22513958.