1. Ab'saber, A. N., 1977: Os domínios morfoclimáticos na América de Sul. Primeira aproximação. ? Geomorfologia52: 1?21.
2. Ackerman, J., 1983: Specificity and mutual dependency of the orchid-euglossine bee interaction. ? Biol. J. Linn. Soc.20: 301?314.
3. Barboza, G., 1988: Estudios morfológicos enJaborosa (Solanc.): Análisis comparativo de las estructuras vegetativas y reproductivas relativas a la evolución del género. ? Thesis, University of Córdoba, Argentina.
4. Beker, R., Dafni, A., Eisikowitch, D., Ravid, U., 1989: Volatiles of two chemotypes ofMajorana syriaca L. (Labiatae) as olfactory cues for the honeybee. ? Oecologia79: 446?451.
5. Bergström, G., 1978: Role of volatile chemicals inOphrys-pollinator interactions. ? InHarborne, G., (Ed.): Biochemical aspects of plant and animal coevolution, pp. 107?230. ? London, New York: Academic Press.