1
Academic Journal
Authors: Butzer, Paul L.
Superior Title: Archiv der Mathematik. October 1956 7(4):295-309
2
Academic Journal
Authors: Butzer, P. L.
Superior Title: Archiv der Mathematik. March 1958 8(6):405-408
3
Academic Journal
Authors: Butzer, P. L.
Superior Title: Archiv der Mathematik. December 1962 13(1):302-312