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♦ ¹THE IMPORTANCE OF SOLITARY BEES ON THE REPRODUCTIVE BIOLOGY OF TIMBER TREES AT THE TAPAJÓS NATIONAL FOREST, BRAZIL, Márcia Motta Maués, Milene Silva de Souza, Milton Kanashiro, Solitary Bees – Conservation, Rearing and Management for Pollination, International Workshop on Solitary Bees and Their Role in Pollination, held in Beberibe, Ceará, Brazil, in April 2004, pp. 241-254
♦ ²Pollination networks of oil-flowers: a tiny world within the smallest of all worlds, Bezerra, Elisângela L.S.; Machado, Isabel C.; Mello, Marco A. R., Journal of Animal Ecology, Volume 78, Number 5, September 2009 , pp. 1096-1101(6)
♦ ³OIL-COLLECTING BEES AND RELATED PLANTS: A REVIEW OF THE STUDIES IN THE LAST TWENTY YEARS AND CASE HISTORIES OF PLANTS OCCURRING IN NE BRAZIL, Isabel Cristina Machado, Solitary Bees – Conservation, Rearing and Management for Pollination, International Workshop on Solitary Bees and Their Role in Pollination, held in Beberibe, Ceará, Brazil, in April 2004, pp. 255-280