%0 Journal Article %A Matthieu Bonnivard %A Antoine Lemenant %A Vincent Millot %T On a phase field approximation of the planar Steiner problem: Existence, regularity, and asymptotic of minimizers %J Interfaces and free boundaries %D 2018 %P 69-106 %V 20 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4171/ifb/397/ %R 10.4171/ifb/397 %F 10_4171_ifb_397