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Cates RG, Rhoades DF (1977). "Patterns in the production of antiherbivore chemical defenses in plant communities". Biochemical Systematics and Ecology. 5 (3): 185–193. Bibcode:1977BioSE...5..185C. doi:10.1016/0305-1978(77)90003-5.
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Perry, Nigel B.; Benn, Michael H.; Brennan, Nerida J.; Burgess, Elaine J.; Ellis, Gill; Galloway, David J.; Lorimer, Stephen D.; Tangney, Raymond S. (1999). "Antimicrobial, Antiviral and Cytotoxic Activity of New Zealand Lichens". The Lichenologist. 31 (6): 627–636. Bibcode:1999ThLic..31..627P. doi:10.1006/lich.1999.0241. S2CID86005089.