Constant Angle Ruled Surfaces in Euclidean Spaces
  In this paper, we study the special curves and ruled surfaces on helix hypersurface whose tangent planes make a constant angle with a fixed direction in Euclidean n-space Besides, we observe some special ruled surfaces in and give requirement of being developable of the ruled surface. Also, we investigate the helix surface generated by a plane curve in Euclidean 3-space . 
Yusuf Yayli, Evren Ziplar
math.DG