Comptes Rendus de L'Academie Bulgare des Sciences, cilt.67, sa.5, ss.613-622, 2014 (SCI-Expanded)
Wintgen ideal surfaces in E4 form an important family of surfaces, namely surfaces with circular ellipse of curvature. Obviously, Wintgen ideal surfaces satisfy the pointwise equality K + |Kn|=||H||2. In the present study we consider the Wintgen ideal surfaces in n-dimensional Euclidean space En. We have shown that Wintgen ideal surfaces in En satisfying the semiparallelity condition R(X, Y) h = 0 are of flat normal connection. Further, we obtain some results in E4.