Marginally trapped meridian surfaces of parabolic type in the   four-dimensional Minkowski space
  A marginally trapped surface in the four-dimensional Minkowski space is a spacelike surface whose mean curvature vector is lightlike at each point. We introduce meridian surfaces of parabolic type as one-parameter systems of meridians of a rotational hypersurface with lightlike axis in Minkowski 4-space and find their basic invariants. We find all marginally trapped meridian surfaces of parabolic type and give a geometric construction of these surfaces. 
Georgi Ganchev and Velichka Milousheva
math.DG math-ph math.MP