@inbook{inbook89f65fc4,
title   = {Relative abundance phenology of bess ( hym. Apoidea ) in São Paulo, Brasil},
author = {Knell, F R N and Bego, L R and Imperatriz-Fonseca, Vera Lucia},
year = {1987},
publisher = {J Peperny},
journal   = {Chemistry and Biology of Social Insects}
}