Need Help with Research on Paul and Suffering

Currently in my thesis research I am looking at Paul’s perspective on and theology of suffering. I was hoping any of you out there could offer bibliographic items that are seminal or highly recommended on this. What I have been working with so far is:

Jervis, L.A. At the Heart of the Gospel (2007).

Gorman, M.J. Cruciformity (2001).

Smith, Barry D. Paul’s Seven Explanations of the Suffering of the Righteous (2000).

Harvey, A.E. Renewal Through Suffering (1996).

Bloomquist, G. The Function of Suffering in Philippians (1993).

Pate, C.M. The Glory of Adam and the Afflictions of the Righteous: Pauline Suffering in Context (1993)

Hafemann, S. Suffering and Ministry in the Spirit (1990).

1981 Suffering and Martyrdom in the NT (FS for G.M. Styler)

I also plan on reading some Moltmann.  What else can anyone recommend (especially with a view towards Paul in particular or NT in general)?
Thanks!