Forest F, Chase MW, Persson C, Crane PR, Hawkins JA (2007). "The role of biotic and abiotic factors in evolution of ant dispersal in the milkwort family (Polygalaceae)". Evolution. 61 (7): 1675–1694. doi:10.1111/j.1558-5646.2007.00138.x. PMID17598748.
Forest F, Chase MW, Persson C, Crane PR, Hawkins JA (2007). "The role of biotic and abiotic factors in evolution of ant dispersal in the milkwort family (Polygalaceae)". Evolution. 61 (7): 1675–1694. doi:10.1111/j.1558-5646.2007.00138.x. PMID17598748.