Key points are not available for this paper at this time.
Paulo S. Oliveira, Hermogenes F. Leitao-Filho, Extrafloral Nectaries: Their Taxonomic Distribution and Abundance in the Woody Flora of Cerrado Vegetation in Southeast Brazil, Biotropica, Vol. 19, No. 2 (Jun., 1987), pp. 140-148
Oliveira et al. (Mon,) 研究了这一问题。