I have added numerous resources this evening, but the following are the most important:
Brege, Daniel J. “Eucharistic Overtones Created by Sacrificial Concepts in the Epistle to the Hebrews.” Concordia Theological Quarterly 66 (2002): 61–81. [Complete issue]
DeSilva, David A. “Despising Shame: A Cultural-Anthropological Investigation of the Epistle to the Hebrews.” Journal of Biblical Literature 113 (1994): 439–61.
Dyer, Bryan R. “‘A Great Conflict Full of Suffering’: Suffering in the Epistle to the Hebrews in Light of Feminist Concerns.” McMaster Journal of Theology and Ministry 12 (2010–2011): 179–98.
Grudem, Wayne. “Perseverance of the Saints: A Case Study from Hebrews 6:4–6 and the Other Warning Passages in Hebrews.” Pages 133–82 in The Grace of God, the Bondage of the Will. Volume 1. Biblical and Practical Perspectives on Calvinism. Edited by Thomas R. Schreiner and Bruce A. Ware. Grand Rapids: Baker, 1995.
Houwelingen, Rob van. “The Epistle to the Hebrews: Faith Means Perseverance.” Journal of Early Christian History 3.1 (2013): 98–115.
Murray, Scott R. “The Concept of διαθήκη in the Letter to the Hebrews.” Concordia Theological Monthly 66 (2002): 41–60. [Complete issue]
Pak, Joseph K. “False Believers in the Letter to the Hebrews.” The American Journal of Biblical Theology 15.12. Online paper, 2014.
Swetnam, James. "Selected Observations on the Christology of the Epistle to the Hebrews." 2013.
Tönges, Elke. “The Epistle to the Hebrews as a “Jesus-Midrash.” Pages 89–105 in Hebrews: Contemporary Methods – New Insights. Edited by Gabriella Gelardini. Biblical Interpretation Series 75. Leiden: Brill, 2005.
Milligan, R. The New Testament Commentary. Vol. IX: Epistle to the Hebrews. Dallas: Eugene S. Smith, 1875.
Gregory Woodae. “Figural Reading in the Epistle to the Hebrews: A Dialogue withAugustine and Calvin.” Ph.D. diss., Duke University, 2010.
Farley, Lawrence R. The Epistle to the Hebrews: High Priest in Heaven. Review by Lasha Tchantouridzé.