Chapter Butzer, Paul L. (1998)
Scholars of the mathematical sciences in the Aachen-Liège-Maastricht region during the past 1200 years: An overview. With the assistance of Butzer Felleisen, Helga. In: Charlemagne and his heritage: 1200 years of civilization and science in Europe. Volume 2: Mathematical arts (p. 43). (/isis/citation/CBB000080056/) unapi

Book Science in western and eastern civilization in Carolingian times (1993). (/isis/citation/CBB000048215/) unapi

Chapter Butzer, Paul L. (1993)
Table of scholars and works in science (AD 400-950). In: Science in western and eastern civilization in Carolingian times (p. 599). (/isis/citation/CBB000051541/) unapi

Chapter Butzer, Paul L. (1993)
Mathematics in West and East from the 5th to 10th centuries: An overview. In: Science in western and eastern civilization in Carolingian times (p. 443). (/isis/citation/CBB000050815/) unapi

Article Butzer, Paul L.; Jongmans, François (1989)
P. L. Chebyshev (1821-1894) and his contacts with western European scientists. Historia Mathematica (pp. 46-68). (/isis/citation/CBB000028672/) unapi

Article Butzer, Paul L. (1987)
Dirichlet and his role in the founding of mathematical physics. Archives Internationales d'Histoire des Sciences (pp. 49-82). (/isis/citation/CBB000064812/) unapi

Article René-François de Sluse (1622-1685): Actes du Colloque international, Amay-Liège-Visé, 20-22 mars 1985 (1986). Bulletin de la Société Royale des Sciences de Liège (pp. 1-269). (/isis/citation/CBB000041372/) unapi

Article Butzer, Paul L.; Jansen, Manfred; Zilles, Hubert (1984)
Zum bevorstehenden 125. Todestag des Mathematikers Johann Peter Gustav Lejeune Dirichlet (1805-1959). Sudhoffs Archiv: Zeitschrift fuer Wissenschaftsgeschichte (pp. 1-20). (/isis/citation/CBB000016937/) unapi

Book Butzer, Paul L.; Fehér, F. (1981)
E. B. Christoffel: The influence of his work on mathematics and the physical sciences. (/isis/citation/CBB000008969/) unapi

Article Butzer, Paul L. (1981)
An outline of the life and work of E. B. Christoffel (1829-1900). Historia Mathematica (pp. 243-276). (/isis/citation/CBB000013235/) unapi

Article Butzer, Paul L.; Fehér, Franziska (1980)
Elwin Bruno Christoffel zum 150. Geburtstag. Naturwissenschaftliche Rundschau (pp. 45-47). (/isis/citation/CBB000001419/) unapi