%0 Journal Article
%A Apostolakis, Nikos
%T On 4–fold covering moves
%J Algebraic and Geometric Topology
%D 2003
%P 117-145
%V 3
%N 1
%U http://geodesic.mathdoc.fr/articles/10.2140/agt.2003.3.117/
%R 10.2140/agt.2003.3.117
%F 10_2140_agt_2003_3_117