Their study and publications covered the Late Palaeozoic stratigraphy of the Carnic Alps.[1][2] In 1937, Aigner and Kahler subdivided the genus Pseudoschwagerina into five subgroups; they then proposed a subgeneric name, Zellia for one of the groups.[3] After the end of World War II in 1945, she and her husband restarted their career and established links with the world.[1]