@inbook{inbook9272a304,
title   = {Cooperation and competition in a colony of the polygynous stingless bee Melipona bicolor, illustrated by two kinds of worker eggs and the behaviours of workers laying them},
author = {Velthuis, Hayo Hans Willen and Pereboom, Zjeffrie and Koedam, Dirk and Imperatriz-Fonseca, Vera Lucia},
year = {2003},
publisher = {Nederlandse Entomologische Vereniging},
booktitle   = {Proceedings of the Section Experimental and Applied Entomology of the Netherlands Entomological Society (N.E.V.}
}