Eucera (Eucera) nigrescens PÉREZ, 1879

Literature

• Baldock, D., Wood, T., Cross, I., Smit, J. 2018. The Bees of Portugal (Hymenoptera: Apoidea: Anthophila) – Entomofauna Suppl. S22: 1–164.
• Ban, C.M. 2006. Checklist of Anthophorid species (Hymenoptera: Anthophoridae) from Romania. Studii şi comunicări piatra neamţ, pp. 245 – 251.
• Ban, C.M. and Tomozei, B. 2006. New data on the Apoid Hymenopterans (Hymenoptera: Andrenidae, Anthophoridae, Apidae) from Dobrogea (Romania). Travaux du Museum NHN “Grigore Antipa” XLIX. pp307-318.
• Banaszak, J. and Dochkova, B. 2014. Bees (Hymenoptera, Apoidea, Apiformes) in the agricultural landscape of Bulgaria: species diversity Journal of Apicultural Science Vol. 58 No. 1 pp. 29-49.
• Bieri, S. 2002. Die Bienen und Wespen des Fürstentums Liechtenstein. Amtlicher Lehrmittelverlag.
• Bournérias M & Prat D (éds) 2005. Les Orchidées de France, Belgique et Luxembourg (2nd Edition). Biotope, coll. Parthénope, Mèze.
• Else, G.R. & Edwards, M. 2018. Handbook of the Bees of the British Isles. Ray Society, London.
• Falk, S. 1991. A review of the scarce and threatened bees, wasps and ants of Great Britain. Research and Survey in Nature Conservation 35: 1-344.
• Filatov, M.A., Ivanov, S.P., Budashkin, Y.I. 2006. .
• Peeters, T.M.J., I.P. Raemakers & J. Smit 1999. Voorlopige atlas van de Nederlandse bijen (Apidae). European Invertebrate Survey Nederland, Leiden, 230 pp.
• Rasmont, P., P.A. Ebmer, J. Banaszak & G. van der Zanden 1995. Hymenoptera Apoidea Gallica. Liste taxonomique des abeilles de France, de Belgique, de Suisse et du Grand-Duché de Luxembourg. Bulletin de la Société entomologique de France, 100(H.S.): 1-98.
• Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8: 1-398.
• Vereecken, N.J., Risch, S., & Cortis, P. 2007. A contribution to the pollination biology of Ophrys scolopax Cavanilles (Orchidaceae) in southern France.
• Westrich, P. 1989. Die Wildbienen Baden-Württembergs. Verlag Eugen Ulmer, Stuttgart, Allgemeiner Teil, pp.1-431; Spezieller Teil, pp.432-972.