Contribution to taxonomy and faunistics of the Gerridae from Vietnam, with descriptions of the genus Andersenius gen. nov. from the subfamily Ptilomerinae and of further species (Insecta: Heteroptera: Gerridae). Entomologische Abhandlungen (Dresden), 57(2), 20 Dezember 1996: 149-182. 177 [Zoological Record Volume 133]