[6421] Non-homogeneous binary quadratic forms

[6422] Harald Bohr

[6423] The diophantine equation$ax$^{3}+$by$^{3}+$cz$^{3}=0.

[6424] The minimum of a binary quartic form (II)

[6425] Über den allgemeinen Integralsinus Si ($z, a$)