Daws, M. I., Burslem, David F. R. P., Crabtree, L. M., Kirkman, P., Mullins, C. E., and Dalling, James W. 2002. "
Differences in seed germination responses may promote coexistence of four sympatric Piper species."
Functional Ecology, 16, (2) 258–267.
https://doi.org/10.1046/j.1365-2435.2002.00615.x.