The latest issue of Criswell Theological Review has an article on Hebrews:
Mel Winstead. "The Significance of Verbal Aspect on the Participles in Hebrews 6:1–12." Criswell Theological Review ns 12.1 (Fall 2014): 109–22.
Here is the description from their blog:
"Finally, our sixth article is provided by Mel Winstead who serves as
Assistant Professor of Biblical Studies at Southern Evangelical Seminary
in Charlotte, NC. In his essay, Winstead endeavors to show how the
grammatical factor of verbal aspect can enhance our understanding of New
Testament texts. To do so, Winstead examines the role of verbal aspect
in Greek grammar and then surveys its role in the use of various
participles in the famous warning passage of Hebrews 6:1-12."