Gottfried S.G.S.FraenkelGottfried S.G.S., The Raison d'Etre of Secondary Plant Substances: These odd chemicals arose as a means of protecting plants from insects and now guide insects to food, „Science”, 129 (3361), 1959, s. 1466–1470, DOI: 10.1126/science.129.3361.1466, PMID: 13658975(ang.).
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Gottfried S.G.S.FraenkelGottfried S.G.S., The Raison d'Etre of Secondary Plant Substances: These odd chemicals arose as a means of protecting plants from insects and now guide insects to food, „Science”, 129 (3361), 1959, s. 1466–1470, DOI: 10.1126/science.129.3361.1466, PMID: 13658975(ang.).