Further record of Lasius neglectus Van Loon, Boomsma et Andrasfalvy (Hymenoptera: Formicidae) for Warsaw, with a key to the Polish species of the subgenus Lasius s. str. - Czechowska, Wiesława; Czechowski, Wojciech; Polska Akademia Nauk. Muzeum i Instytut Zoologii (2003)