BULLETIN OF THE MALAYSIAN MATHEMATICAL SCIENCES SOCIETY, cilt.31, sa.2, ss.209-215, 2008 (SCI-Expanded)
In the present study, we calculate the coefficients of the second fundamental form and curvature ellipse of Chen surfaces in E-4. Further, we live the necessary and sufficent condition for the origin of NpM to lie on the curvature ellipse of Vranceanu surfaces, which are special type, of Chen surfaces.