%0 Journal Article %A Martin Helm %T On $B_{2k}$-sequences %J Acta Arithmetica %D 1993 %P 367-371 %V 63 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-63-4-367-371/ %R 10.4064/aa-63-4-367-371 %G en %F 10_4064_aa_63_4_367_371