The most extensive attempt to establish sound correspondences between Indo-European and Uralic to date is that of the late Slovenian linguist Bojan Čop. It was published as a series of articles in various academic journals from 1970 to 1989 under the collective title "Indouralica". The topics to be covered by each article were sketched out at the beginning of "Indouralica II". Of the projected 18 articles only 11 appeared. These articles have not been collected into a single volume and thereby remain difficult to access.