Articles
Selected articles of Knopp include:
- (in German)
- (in German)
- (in German)
- (in German)
- (in German)
- (in German)
He was the co-founder of Mathematische Zeitschrift (in which the majority of his above-cited articles are published) in 1918, being the editor from 1934 to 1952.
After retirement Knopp continued to do mathematics, publishing for example
and delivering the lecture
Folgenräume und Limitierungsverfahren at the first meeting of the International Mathematics Union in 1952.
Books
Knopp's mathematical research was on "generalized limits" and he wrote two books on sequences and series:
He also authored two texts on functions of a complex variable as well as a problem book:
He also produced the sixth edition of the three-volume work (a fourth volume was later added by Friedrich Lösch in 1980):