Retraction: Barczak T, Debek-Jankowska A, Bennewicz J. Primary parasitoid and hyperparasitoid guilds (Hymenoptera) of grain aphid (Sitobion avenae F.) in northern Poland. Arch Biol Sci. 2015;67(2):695-703, DOI:10.2298/ABS140915038B - Retraction Notice | RetractBase