Vector-valued Lp-convergence of orthogonal series and Lagrange interpolation. Hermann König; Niels J. Nielsen — 1994 Forum mathematicum
A Banach space with a symmetric basis which is of weak cotype 2 but not of cotype 2 Peter G. Casazza; Niels J. Nielsen — 2003 Studia Mathematica We prove that the symmetric convexified Tsirelson space is of weak cotype 2 but not of cotype 2.