- Series title: Haroldius
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- Krikken, J. 2009: Drepanocerine dung beetles: a group overview, with description of new taxa (Coleoptera: Scarabaeidae: Scarabaeinae). Haroldius, (4): 3–30.
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- Krikken, J. 2009: Indognorimus and Indotrichius, new genera for South Asian Trichiini: a taxonomic clarification (Coleoptera: Cetoniidae). Haroldius, (3): 3–15.
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- Krikken, J. 1987: Cryptogenius Westwood and Cremastochilodius Krikken (Coleoptera: Hybosoridae). Haroldius, (2): 15.
- Krikken, J. 1987: A new Melinesthes from Rwanda, with notes on related species (Coleoptera: Cetoniidae). Haroldius, (2): 6–14.
- Krikken, J.; Huijbregts, J. 1987: Subspecific differentiation in Paragymnopleurus sparsus (Sharp), a ball-rolling scarab species from Sundaland (Coleoptera: Scarabaeidae). Haroldius, (2): 1–5. PDF
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- Krikken, J. 1986: Provisional checklist of the Valginae (Coleoptera: Cetoniidae). Haroldius, (1): 1–17.
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