BULLETIN OF THE MALAYSIAN MATHEMATICAL SCIENCES SOCIETY, vol.31, no.2, pp.209-215, 2008 (Journal Indexed in SCI)
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.