Helmut Hasse was a German mathematician working in algebraic number theory, known for fundamental contributions to class field theory, the application of p-adic numbers to local class field theory and
Kurt Hensel
…Works by or about Kurt Hensel at the Internet Archive Helmut Hasse: Kurt Hensel zum Gedächtnis in: Journal für die reine und angewandte Mathematik 187 (1949), S. 1-13 Die Hensel-Familie im Stammbaum der Katzenelnbogen…