Is there any result on approximating a minimum (weighted) bipartite vertex cover? I'm interested in the problem that given a bipartite graph ( probably with weight on its vertex ), find a vertex cover of size (or weight) at most ($1+\epsilon$) of the optimal value. I've been searching on internet and although it seems the problem was quite simple, there's no paper or lecture notes about it. (maybe because everybody know :)).
Can anyone give a link to related work if you know any :D