Romanov A. S. 
          On the traces of Sobolev functions on the boundary of a cusp 
          with a Hölder singularity
        For the Sobolev classes Wp1 on a “zero” 
          cusp with a Holder singularity at the vertex, we consider the question 
          of compactness of the embedding of the traces of Sobolev functions into 
          the Lebesgue classes on the boundary of the cusp.