1. Unilateral quasi-regularizers of closed operators;Cross,1980
2. On the continuous linear image of a Banach space;Cross;J. Austral. Math. Soc. Ser. A,1980
3. Unbounded strictly singular operators;Cross;Nederl. Akad. Wetensch. Indag. Math. Ser. A,1988
4. Unbounded linear transformations of upper semi-Fredholm type in normed spaces;Cross;Portugal. Math.,1990
5. Properties of some norm related functions of unbounded linear operators;Cross;Math. Z.,1988