1. D. E. Alspach and S. A. Argyros, Complexity of weakly null sequences, Dissertationes Math. (Rozprawy Mat.) 321 (1992), 44.
2. G. Androulakis, P. Dodos, G. Sirotkin and V. G. Troitsky, Classes of strictly singular operators and their products, Israel J. Math. 169 (2009), 221–250.
3. S. A. Argyros and I. Deliyanni, Banach spaces of the type of Tsirelson, preprint, 1992; available at \arxivurlarXiv:math/9207206.
4. S. A. Argyros and I. Deliyanni, Examples of asymptotic $\ell_1$ Banach spaces, Trans. Amer. Math. Soc. 349 (1997), no. 3, 973–995.
5. S. A. Argyros, I. Deliyanni and A. G. Tolias, Strictly singular non-compact diagonal operators on HI spaces, Houston J. Math. 36 (2010), no. 2, 513–566.