Template:López-Colón, 1993a
- López-Colón, J.I. 1993. Taxonomy of the Elaphocera Gene, 1836 of the "heydeni" group: Elaphocera ardoini Baraud, 1966, Elaphocera margaritae (Blanco Villero, 1988) and Elaphocera bicolorea Baraud, 1992, new synonyms of Elaphocera heydeni Kraatz, 1882 (Coleoptera, Scarabaeidae, Melolonthinae, Pachydemini). Giornale italiano di entomologia 6(34): 383–390.
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- Publication date: '31 Agosto 1993' [sourced from first page of article]