Reference:

[1] Tan HTW, Ibrahim A, Tan K. A new record of Piper aduncum L. (Piperaceae) in Singapore. Nature in Singapore 2008;1:55-59. | Read article |

[2] Hartemink AE. The invasive shrub Piper aduncum in Papua New Guinea: a review. J Tropical Forest Science 2010;22(2):202-213. | Read article |