Normal Transport Surfaces in Euclidean 4-space $\mathbb{E}^{4}$
  In the present paper we study normal transport surfaces in four-dimensional Euclidean space $\mathbb{E}^{4}$ which are the generalization of surface offsets in $\mathbb{E}^{3}$. We find some results of normal transport surfaces in $\mathbb{E}^{4}$ of evolute and parallel type. Further, we give some examples of these type of surfaces. 
K. Arslan, B. Bulca, B. K. Bayram, G. \"Ozt\"urk
math.DG