euler gained his doctorate (ph.d.) in 1979 at gießen university (prof. rolf hiersche) with a theses on parallels in nominal formation between indo-iranian languages and greek. the study was received as a contribution to the identification of greek being part of the phylogenetic eastern group of indoeuropean languages, despite of the western geographic location of greece. up until today, euler has published about 80 scientific articles and books covering most branches of the indoeuropean languages; major contributions refer to the baltic, indo-iranian, greek and germanic languages.