%0 Journal Article
%A N. I. Dubrovin
%T Formal sums and power series over a~group
%J Sbornik. Mathematics
%D 2000
%P 955-971
%V 191
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_2000_191_7_a1/
%G en
%F SM_2000_191_7_a1