Filz, Katharina J; Engler, Jan O; Stoffels, Johannes; Weitzel, Matthias; Schmitt, Thomas (2012). "Missing the target? A critical view on butterfly conservation efforts on calcareous grasslands in south-western Germany". Biodiversity and Conservation. 22 (10): 2223–41. doi:10.1007/s10531-012-0413-0. S2CID16496867. INIST27586585.
Callegari, Sarah E; Bonham, Emma; Hoodless, Andrew N; Sage, Rufus B; Holloway, Graham J (2014). "Impact of game bird release on the Adonis blue butterfly Polyommatus bellargus (Lepidoptera Lycaenidae) on chalk grassland". European Journal of Wildlife Research. 60 (5): 781–7. doi:10.1007/s10344-014-0847-7. S2CID59906. INIST28735005.
Filz, Katharina J; Engler, Jan O; Stoffels, Johannes; Weitzel, Matthias; Schmitt, Thomas (2012). "Missing the target? A critical view on butterfly conservation efforts on calcareous grasslands in south-western Germany". Biodiversity and Conservation. 22 (10): 2223–41. doi:10.1007/s10531-012-0413-0. S2CID16496867. INIST27586585.
Callegari, Sarah E; Bonham, Emma; Hoodless, Andrew N; Sage, Rufus B; Holloway, Graham J (2014). "Impact of game bird release on the Adonis blue butterfly Polyommatus bellargus (Lepidoptera Lycaenidae) on chalk grassland". European Journal of Wildlife Research. 60 (5): 781–7. doi:10.1007/s10344-014-0847-7. S2CID59906. INIST28735005.
Filz, Katharina J; Engler, Jan O; Stoffels, Johannes; Weitzel, Matthias; Schmitt, Thomas (2012). "Missing the target? A critical view on butterfly conservation efforts on calcareous grasslands in south-western Germany". Biodiversity and Conservation. 22 (10): 2223–41. doi:10.1007/s10531-012-0413-0. S2CID16496867. INIST27586585.
Callegari, Sarah E; Bonham, Emma; Hoodless, Andrew N; Sage, Rufus B; Holloway, Graham J (2014). "Impact of game bird release on the Adonis blue butterfly Polyommatus bellargus (Lepidoptera Lycaenidae) on chalk grassland". European Journal of Wildlife Research. 60 (5): 781–7. doi:10.1007/s10344-014-0847-7. S2CID59906. INIST28735005.