Some observations on the Notonectidae (Hemiptera-Heteroptera) of Viêt-Nam and adjacent regions / Ivor Lansbury. — Warszawa : Państwowe Wydawnictwo Naukowe, 1964. — 17 с. — (Annales zoologici ; t. 22, № 10) - Lansbury, Ivor (Annales zoologici, 1964)