Columbia subject headings:
Harvard subject headings:
Mathematics--Germany--Jena--History--Congresses.
Mathematics--Study and teaching--Germany--Jena--History--Congresses.
Universität Jena--History--Congresses.
Princeton subject headings:
Mathematics, German--History--Congresses.
Mathematics--Study and teaching (Higher)--Germany--Congresses.
Universität Jena--Intellectual life--History--Congresses.