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Zwölfer, H. 1961, A comparative analysis of the parasites complexes of the European fir budworm, Choristoneura murinana (Hyb.) and the North American spruce budworm, C. fumiferana (Clem.). Technical Bulletin. Commonwealth Institute of Biological Control.
No 1:1-162
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Zwölfer, H. 1963, Untersuchungen über die Struktur von Parasitenkomplex bei einigen Lepidopteren. Zeitschrift für Angewandte Entomologie
51(4):346-357
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Zwölfer, H. 1967, Mutual influence of the course of development of entomophagous parasites and their hosts, illustrated by the examples of Coleophora spp. (and the parasite Agathis sp.) and Urophora spp. (and the parasite Eurytoma tibialis Boh. (formerly misidentified as E. curta Wlk.)). Anzeiger für Schädlingskunde
40(8):113-120
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Zwölfer, H. 1967, Insect introductions and biological control. IUCN Publications New Series
9:141-150
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Zwölfer, H. 1968, Preliminary studies of the parasites of Cnephasia virgaureana Tr. (Lep.: Tortricidae) and of related species in middle Europe. Technical Bulletin. Commonwealth Institute of Biological Control.
No 10:1-22
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Zwölfer, H. 1968 (31 May 1968), The parasite complexes of the European and North American fir tortricids (Choristoneura spp.) from the biogeographic viewpoint. Zeitschrift für Angewandte Entomologie
61(4):448-452
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Zwölfer, H. 1969, Urophora siruna-seva (Hg.) (Dipt.: Trypetidae), a potential insect for the biological control of Centaurea solstitialis L. in California. Technical Bulletin. Commonwealth Institute of Biological Control.
No 11:105-155
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Keywords: Hosts; Parasitism
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Zwölfer, H. 1979, Alternative Wettbewerbsstrategien bei koexistierenden Eurytoma-Arten (Hymenoptera: Eurytomidae). Verhandlungen der Deutschen Zoologischen Gesellschaft
72:256
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Zwölfer, H.; Böheim, M.; Beck, E. 2015, Eurytoma serratulae and E. robusta (Hymenoptera: Eurytomidae): complementary host exploitation strategies of coexisting parasitoids and their impact on the host Urophora cardui. Journal of Hymenoptera Research
42:47-62
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Zwölfer, H.; Bönheim, M.; Beck, E. 2007, Eurytoma robusta (Hymenoptera: Eurytomidae), a local key factor in the population dynamics of Urophora cardui (Diptera: Tephritidae): a comparative analysis. European Journal of Entomology
104(2):217-224
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Keywords: Hosts; Parasitism
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