Kraus, J.E., et al. “Structure of Insect Galls on Two Sympatric Subspecies of Chrysothamnus Nauseosus (Pall. Ex Pursh) Britton (Asteraceae)”. Boletim De Botânica Da Universidade De São Paulo, vol. 21, no. 2, Dec. 2003, pp. 251-63, https://doi.org/10.11606/issn.2316-9052.v21i2p251-263.