On a class of partial t -spreads of P G ( n , q ) arising from scrolls. Ballico, E.; Cossidente, A. — 2000 Mathematica Pannonica
Subvarieties of Segre varieties and trisecant lines. Ballico, E.; Cossidente, A. — 1997 Mathematica Pannonica
On the homogeneous ideal of unreduced projective schemes. Ballico, E.; Cossidente, A. — 1996 Mathematica Pannonica