[821] On the solvability of the diophantine equation$ax$^{2}+$by$^{2}+$cz$^{2}=0 in imaginary Euclidean quadratic fields

[822] Abhandlungen zur Theorie der konformen Abbildung

[823] Grundlagen der Wahrscheinlichkeitsrechnung

[824] On the projection of a plane set of finite linear measure

[825] The valuation theory of meromorphic function fields over open Riemann surfaces