Taxonomic constraints for the conservation and sustainable use of wild pollinators: the brazilian wild bees - Silveira, Fernando Amaral da; Pinheiro-Machado, Cynthia; Alves-dos-Santos, Isabel; Kleinert, Astrid de Matos Peixoto; Imperatriz-Fonseca, Vera Lucia (Pollinating bees : the conservation link between agriculture and nature, 2002)