@book{Cromme, author = {Cromme, Ludwig}, title = {Eine erweiterte Leibnizsche Regel und Anwendungen}, publisher = {BTU, Fak. f{\"u}r Mathematik, Naturwiss. und Informatik}, address = {Cottbus}, pages = {10}, language = {de} } @article{Cromme, author = {Cromme, Ludwig}, title = {Interchanging Integration and Differentiation. Nonlinear Analysis.}, language = {en} }