[526] The approximation to algebraic numbers by rationals

[527] The diophantine equation$ax$^{3}+$by$^{3}+$cz$^{3}=0. Completion of the tables

[528] On the part of the motion of the lunar perigee which is a function of the mean motions of the sun and moon

[529] Inequalities related to certain couples of local rings

[530] Actions of compact abelian groups on semifinite injective factors