Reference
Libor Dvorak, Vladimir Smetana, Jakub Straka, Pavel Devan (2006): Present distribution of the paper wasp Polistes bischoffi WEYRAUCH 1937 in the Czech Republic and in Slovakia with notes to its spreading (Hymenoptera: Vespidae) – Linzer biologische Beiträge – 0038_1: 533 - 539.