k - Convexity in euclidean 3 - space
On the duality of generalised Euler formula for Euclidean hypersurfaces
On the rectilinear congruences generated by the instantaneous screwing axes connected with a surface
A class of meromorphic univalent functions with positive and fixed finitely many coefficients
The Seifert - Van Kampen theorem for the group of global sections
A note on the fractal dimension