H. F. Swanson and J. Monge-Nájera, “The effects of methodological limitations in the study of butterfly bebavior and demography: a daily study of <i>Vanessa atalanta</i> (Lepidoptera: Nymphalidae) for 22 years”, Rev. Biol. Trop., vol. 48, no. 2-3, pp. 605–614, Jul. 2000.