@article{articled2f678b1,
title   = {A morphologically specialized soldier caste improves colony defense in a neotropical eusocial bee},
author = {Grüter, Christoph and Menezes, Cristiano and Imperatriz-Fonseca, Vera Lucia and Ratnieks, Francis L. W},
year = {2012},
doi = {10.1073/pnas.1113398109},
journal   = {Proceedings of the National Academy of Sciences - PNAS}
}