4-dimensional minimal CR submanifolds of the sphere S6 satisfying Chen's equality

In this paper, we classify 4-dimensional minimal CR submanifolds M   of the nearly Kähler 6-sphere S6(1)S6(1) which satisfy Chen's equality, i.e. δM=152, where δM(p)=τ(p)−infK(p)δM(p)=τ(p)−infK(p) for every p∈Mp∈M.