What is the relevance of smallholders' agroforestry systems for conserving tropical tree species and genetic diversity in circa situm, in situ and ex situ settings? A review - Dawson, Ian K.; Guariguata, Manuel R.; Loo, J.; Weber, John C.; Lengkeek, A.; Bush, D.; Cornelius, Jonathan P.; Guarino, Luigi; Kindt, Roeland; Orwa, C.; Russell, J.; Jamnadass, Ramni H. (Springer, 2013)